Button clickable area don't coincide with their position

The problem is the following:
i made a simple program with just 2 buttons and some checkboxes, few rows of code, almost nothing. The thing is that if i click on anything the click is registered as if i clicked around 20 pixel above that point, this makes the program almost impossible to use because you never know where to actually click in order to effectively click on the button.

Please provide a minimum compilable example reproducing the problem.