error on saving

i was making a hardcore song, and at some parts i wanted to put all the keyboards notes at once. i manually made it back in the other sheet i made "nicht für elise". so i loaded the keyboard and i noticed the name was strange, "loading nicht fu~A¼ elise", and i guess the error happened because of the ü in für, since its in german. it couldnt open so i renamed the file to a simpler "nicht fur elise". and it loaded. i copied the full keyboard, pasted it everywhere i wanted, and continued making the hardcore song. but each time i saved, there would be this error on saving saying the file might corrupt, error detail is "Incomplete measure: Full score, measure 26, staff 1. Found: 11/8. Expected: 4/4.
Incomplete measure: Full score, measure 34, staff 1. Found: 11/8. Expected: 4/4.". i turned off the musescore editor and came back to see if the file was corrupted, it only said that the file might cause musescore 4 editor to malfunction. and i dont know what happens if it malfunctions, if all my sheets become corrupted, if i have to install musescore again, i am just not gonna take the risk rn.