This often happens in the editor(i don't know how to create them exactly, but a procedure was given above), but such "circles" can be easily found by hovering cursor over them, the "fake" circles will show a grey dot like a slider. What's more, if you play the map yourself, you'll find you will definitely miss the circle however you click it. These things don't make much sense, their only use is to prevent players from FCing. XDLarto wrote:
This might sound weird, but those "circles" in Lemon Tree are actualy sliders with no slider track. I don't quite know how you can create them, but they're really hard to click. There's also one in "Die Aerzte - Junge" Normal difficulty.