Corrupted Measures

I am making a saxophone quartet piece for my group. Everything was going perfectly, and I was ready to upload the finished product. Then when I went to save the project before uploading it to musescore, it told me the file was corrupted. I clicked to look at the details and found an issue in the Soprano part. It doesn't show up in the full score view, but when I open the individual part there's 7 beats in a measure. (The time signature is in 4/4). 6 Beats of rest, which should not be there, and the quarter note I put there. It wont let me upload the file until its fixed, but I can't remove the rests.

Thanks for any possible help.