My sprite somehow "uses" several times the same costume

I don't know why or how it happened.

Do you have the project saved?

Did you check to see if there's just spaces at the end of the names?

i don't think so, in fact, the costume duplicated itself everytime that i added a shape to it

i didn't save the project yet when it happened

No, I want you to save it after it happens! :~)

yes but i also deleted the costume's copies

Oh. Well, if you can reproduce the problem, then save the project!

Saving wouldn't do anything, it's a graphical glitch. This has happened to me multiple times, but that was by editing a costume not currently selected.