How can I fix Numbers corrupting data on iMac 2017 with Mojave and Catalina?
I've tried reloading data and starting with fresh spreadsheet. Data is corrupted within minutes.
I can't recall seeing data get corrupted. There've been other issues like files that won't open or won't save. Some people have said they have lost data (it reverted to an earlier version) or the file is missing altogether but some of those were incorrect or could be attributed to other reasons. And recently someone had all their tables get reformatted strangely and we couldn't figure out how or why or how to reformat them.
Can you post some additional details and a screenshot or two that shows the problem?