As he said we have discovered with the PF sheet when deleting red bordered error rows, when we hit "refresh" (which calls getSectionIds and updates values for repeating entries) all the red bordered rows re-appear. So the delete is not actually deleting the rows or those IDs from the datastore. These are not the "old ids" like before this is some new issue. For the OP's campaign it is on the spells tab the spells list. For my example campaign below it is a different list. As well as his campaign I have a campaign in dev you can look at: <a href="https://app.roll20dev.net/campaigns/details/38285/" rel="nofollow">https://app.roll20dev.net/campaigns/details/38285/</a>... go to the PC's group, and open the first PC Barnabas. and go to the Attacks tab at the top. Near the bottom are the repeating rows in red. Delete them, then hit "refresh" at the upper right (a circular arrow button) and you'll see them come back. there is also a blank row on the top of the Attacks that we can't even delete at all, or use. I don't know how it got there, but if it could at least be deleted that would give us a workaround.
