PyQt5 - Fail to display QTableWidgetItem data if previous cell have same value?

[Saelyth]

Hm, I just stumbled into an issue that I don't know how to address. Somehow my QtableWidget won't show the data of 2 specific columns if the data on both is the same.
Please check the next screenshot to see what I meant. There shouldn't be invisible values on the 2nd column at all.
b4MAz8NLRCe7lk3jtxfMSA.png
The first row values I doublechecked multiple times and it's "No No", but it only shows first one.
Also doublechecked the 3rd row, the value there is "SÃ* SÃ*", but yet again second one is invisible.
This is the big picture in case you need to check:
M4FvuArqQWic7bBzBLGi-Q.jpg

I fail to see why this happens.

Qt Creator pyuic5 generated code:

self.tablaBuscador = QtWidgets.QTableWidget(self.tab_buscador)
self.tablaBuscador.setGeometry(QtCore.QRect(10, 40, 941, 341))
self.tablaBuscador.setStyleSheet("")
self.tablaBuscador.setColumnCount(0)
self.tablaBuscador.setObjectName("tablaBuscador")
self.tablaBuscador.setRowCount(0)
self.tablaBuscador.verticalHeader().setDefaultSectionSize(25)
self.tablaBuscador.setSortingEnabled(True)

self.tablaBuscador = QtWidgets.QTableWidget(self.tab_buscador)
self.tablaBuscador.setGeometry(QtCore.QRect(10, 40, 941, 341))
self.tablaBuscador.setStyleSheet("")
self.tablaBuscador.setColumnCount(0)
self.tablaBuscador.setObjectName("tablaBuscador")
self.tablaBuscador.setRowCount(0)
self.tablaBuscador.verticalHeader().setDefaultSectionSize(25)
self.tablaBuscador.setSortingEnabled(True)

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This is the code where I create the table columns and headers:

def creatabla_buscador(self):
    # Add columns and give them a header name
    nombres_de_columnas = ["Fecha Entrada", "Proveedor", "Fecha Factura", "Importe",
                           "Cód. Factura", "Pagada", "Contabilizada", "Observaciones"]
    self.tablaBuscador.setColumnCount(len(nombres_de_columnas))
    self.tablaBuscador.setHorizontalHeaderLabels(nombres_de_columnas)
    # Adjust the size to fit perfectly
    header = self.tablaBuscador.horizontalHeader()
    for i in nombres_de_columnas:
        if i == "Observaciones":
            header.setSectionResizeMode(nombres_de_columnas.index(i), QtWidgets.QHeaderView.Stretch)
        else:
            header.setSectionResizeMode(nombres_de_columnas.index(i), QtWidgets.QHeaderView.ResizeToContents)
    # Connect what happens when you click on any cell
    self.tablaBuscador.cellClicked.connect(self.tablabuscador_alclickearceldas)

def creatabla_buscador(self):
    # Add columns and give them a header name
    nombres_de_columnas = ["Fecha Entrada", "Proveedor", "Fecha Factura", "Importe",
                           "Cód. Factura", "Pagada", "Contabilizada", "Observaciones"]
    self.tablaBuscador.setColumnCount(len(nombres_de_columnas))
    self.tablaBuscador.setHorizontalHeaderLabels(nombres_de_columnas)
    # Adjust the size to fit perfectly
    header = self.tablaBuscador.horizontalHeader()
    for i in nombres_de_columnas:
        if i == "Observaciones":
            header.setSectionResizeMode(nombres_de_columnas.index(i), QtWidgets.QHeaderView.Stretch)
        else:
            header.setSectionResizeMode(nombres_de_columnas.index(i), QtWidgets.QHeaderView.ResizeToContents)
    # Connect what happens when you click on any cell
    self.tablaBuscador.cellClicked.connect(self.tablabuscador_alclickearceldas)

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And this is the code I use to create rows filled with data requested from Sqlite3

def rellenatabla_buscador(self):
    # Destroy all table data in order to replace it
    self.tablaBuscador.setRowCount(0)
    # Find the information
    registros = utilidades_db.buscatodoslosregistros("Recibos",
                                                     "SELECT Fechaentrada, Proveedor, Fechafactura, "
                                                     "Importefactura, Codigofacturadelproveedor, Pagada, "
                                                     "Contabilizar, Observaciones FROM FacturasRecibidas "
                                                     "WHERE Proveedor LIKE ?",
                                                     (self.comboBuscador_proveedor.currentText(),), True)
    # Order them by index 0
    registros = utilidades.ordena_registros_por(registros, 0)
    # Create the new rows and add the items
    for registro in registros:
        self.tablaBuscador.insertRow(self.tablaBuscador.rowCount())
        fila = self.tablaBuscador.rowCount() - 1
        for dato in registro:
            registroitem = QtWidgets.QTableWidgetItem(utilidades.ensure_its_str(dato))
            registroitem.setTextAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
            registroitem.setFlags(Qt.ItemIsEnabled | Qt.ItemIsSelectable)
            self.tablaBuscador.setItem(fila, registro.index(dato), registroitem)

def rellenatabla_buscador(self):
    # Destroy all table data in order to replace it
    self.tablaBuscador.setRowCount(0)
    # Find the information
    registros = utilidades_db.buscatodoslosregistros("Recibos",
                                                     "SELECT Fechaentrada, Proveedor, Fechafactura, "
                                                     "Importefactura, Codigofacturadelproveedor, Pagada, "
                                                     "Contabilizar, Observaciones FROM FacturasRecibidas "
                                                     "WHERE Proveedor LIKE ?",
                                                     (self.comboBuscador_proveedor.currentText(),), True)
    # Order them by index 0
    registros = utilidades.ordena_registros_por(registros, 0)
    # Create the new rows and add the items
    for registro in registros:
        self.tablaBuscador.insertRow(self.tablaBuscador.rowCount())
        fila = self.tablaBuscador.rowCount() - 1
        for dato in registro:
            registroitem = QtWidgets.QTableWidgetItem(utilidades.ensure_its_str(dato))
            registroitem.setTextAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
            registroitem.setFlags(Qt.ItemIsEnabled | Qt.ItemIsSelectable)
            self.tablaBuscador.setItem(fila, registro.index(dato), registroitem)

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And I fire them together upon selecting a value on the QComboBox above it, no weird stuff in between:

self.creatabla_buscador()
self.rellenatabla_buscador()

self.creatabla_buscador()
self.rellenatabla_buscador()

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Notes:
Explaining possibly confusing functions.
ensure_its_str = It just check if the data proved is a string. If not, it converts that data as a string: str(data)
buscatodoslosregistros = Just a wrapper for "connect to database, use cursors, disconnect to database".
ordena_registros_por = It just re-order the list of items on an specific index.