MuseScore would never ever change any of your files. Almost certainly, you are simply opening the wrong copy of the file - you have probably been saving it to the wrong folder. Try to remember the the exact filder and file name you actually saved it to and look there,e and check the date. If that doesn't appear to the correct version, then your memory about where you saved it to is wrong. We can help you try to figure out where you might have saved it to instead, but for that kind of assistance using MuseScore, please ask for help on the Supprot forum and be sure to say what version of MuseScore and jts as importantly, what OS. Also the exact pathname you believe you saved it to, and what the date on that file. Basically the sort of information that would help other computer experts help you find the file on your hard drive.
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MuseScore would never ever change any of your files. Almost certainly, you are simply opening the wrong copy of the file - you have probably been saving it to the wrong folder. Try to remember the the exact filder and file name you actually saved it to and look there,e and check the date. If that doesn't appear to the correct version, then your memory about where you saved it to is wrong. We can help you try to figure out where you might have saved it to instead, but for that kind of assistance using MuseScore, please ask for help on the Supprot forum and be sure to say what version of MuseScore and jts as importantly, what OS. Also the exact pathname you believe you saved it to, and what the date on that file. Basically the sort of information that would help other computer experts help you find the file on your hard drive.
Also check for an autosave copy of it.