This is odd, usually we’d recommend you start by first restoring the Accounts sheet and then restoring the Balances sheet to rule out bugs that had already been fixed and deployed or some accidental edit to either of those sheets that broke things.
I’d recommend archiving the Accounts sheet if you’ve made customizations (e.g. set a group or class override) but no need to archive the Balances sheet as it’s just a visualization.
The order of restore is important so do Accounts then Balances.
Let me know if that doesn’t fix it for you.