Honestly not sure why that would have happened to just you. (as I’ve not heard this from anyone else that is.)
Looking at your screenshot though, I definitely wonder if you’ve edited the original script pertaining to the GUI creation section. And I wonder this, given that not only are, eh, two, sections missing on the right-bottom side but even for the ones showing up, it ‘appears’ that their heights are off a little. Which would give cause as to why some of the frames are partially overlapping checkboxes and text in frames above those.
Regardless of my observations, which Maya version are you using, and is the script you are using, downloaded from here and still in its original form?