I lost a month of progress

well basically what the title says. i saved my progress on mobile to my phone to load on my pc and play on there, everything went fine. When in save it on my pc and load it on my phone however, my progress is gone and my skin is back to what it was about a month ago. I have no clue how this could happen, since this old save shouldn't even exist anymore. I've tried everything, but can't seem to get it back. Please help, i just got halfway on skeletal shenanigans and i really don't want to lose that progress.