ankas
It's your Mouse: Cursor is over events, they are a collision of sorts.
You can check this by disabling them.
You have 2 per menu item, which is why there are 10 checks per tick.
You can reduce the number of collision checks by using Else, but I'm not sure it's worth it unless you're planning on adding a huge amount of objects and events to the menu and need to eek out every last ounce of performance (which this wouldn't improve much, if at all)