The "mutant" folder has some characters in it that are not being displayed. Try (as root, of course)
rm -f -r 341
to get rid any folder with those three characters in the name. Be sure of course it will not match any folder you need to keep since this should get them all.
Alternatively you can do:
rm -r *
and you will get a confirmation request for each name and just answer 'y'es to the correct one(s) and - very important - 'n'o to the ones you want to keep. This is very dangerous because a slip of the finger could remove something yo need.