Why does it keep deleting measures?

[scottandrewhutchins]

I had a measure in 7/16. I decided that the notes were faster than I wanted, and tried to change the notes and time signature--a 32nd to a 16th, and two 16ths to two 8ths, changing the measure to 7/8. Every time I attempted this, the measure simply disappeared. It skipped from the first measure to the third measure. I don't understand. I'm copying from a handrwritten manuscript that has so little written yet that I simply closed the file. It was too much of a nuisance to save.