The glitch levels for worlds 2, 4, 5 and 6 disappear from the map after I exit the game. The ones in worlds 1 and 3 are there though.

I haven't completed any of them yet, so I don't know if they will remain unlocked if I complete them. For now though, they don't seem to want to stay there and if I want to try them, I have to re-unlock them (which can be SUCH a pain in some worlds) - or leave the game running all the time! 

Is this related to the Warp Zone bug? Anyone else that has experienced this?

Thanks in advance