I didn't own Start11 for Win 11 + Win 10 yet, because I'm still using Windows 10 at the moment.
This behaviour has no negative effect otherwise, but it causes a Start10 style element to disappear permanently.
There is this line separator design element that is part of the Windows 7 and Modern Style start menus.
If you click rapidly on any adjustable option - for example in Configure section or somewhere else in the program - this will at some point definitely trigger the event that this specific design element(separator line) would permanently disappear from the Windows 7 and Modern Style start menus.
Perhaps you could eventually consider to remove this additional separator line completely.
I personally don't understand the design decision to put an extra separator line into this area.
I'm actually happy that I can remove it with this glitch at the moment.
The start menus look way cooler without this additional line.
The best option is probably that you allow your customers to toggle this specific design element on or off. (without the requirement of using other Stardock products just for that)