I can't create new sprites

So when I want to make a new sprite it doesn't create one, instead it makes all my other sprites disappear not delete just not show.This only happens in one game even if I clone it. I just want to know why this happens or if it can be fixed.

Fixed it

That happened to me once, except I couldn't fix it, I ended up just deleting the program. I'm glad you managed to fix your's. 😊