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Hi ,
I'm Dyari. Thanks for reaching out.
Many users have reported the same issue recently but Microsoft has not yet officially confirmed the issue or announced a fix date.
Please check your Excel version. If it is 2.113.5, check the App Store for a newer update. Until an update is available, I recommend avoiding important edits in the iPad app and temporarily using Excel for the web in Safari.
If the file is still open, try Save a Copy with a different name before closing it. Please do not reinstall Excel until any locally stored files have been backed up, because unsynchronized changes could be lost.