QGridLayout overlapping items

[Santa.fat]

hi friends.

i have some items in a QGridLayout that fine horizontally but vertically overlapped.
when i reduce minimum size of items they are fine but when i increase their size overlapping happens.
this is my code

for number in range(len(items)):
         lbl = QLabel()
         lbl.setMinimumSize(item_size)
         lbl.setContentsMargins(0, 0, 0, 0)
         grid_layout.addWidget(lbl, number, 1, 1, 1)

for number in range(len(items)):
         lbl = QLabel()
         lbl.setMinimumSize(item_size)
         lbl.setContentsMargins(0, 0, 0, 0)
         grid_layout.addWidget(lbl, number, 1, 1, 1)

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