On the Sagan 4 Alpha wiki, we have recently had an issue where some rows on our cargo table have been duplicating upon editing the relevant page. No more than 2 copies of the same page's row have appeared at a time so far.
This is the relevant table (and the only one we have at the moment): https://sagan4alpha.miraheze.org/wiki/Special:CargoTables/SpeciesInfo
And here is an example of a page which has duplicate rows (selected because it's on the first page): https://sagan4alpha.miraheze.org/wiki/Acuo
Note that at the time of posting, there are only a few pages with a duplicate row because I rebuilt the table in an attempt to fix it; more will no doubt appear when other pages are edited, the most duplicates I've seen at a time being around 300. This doesn't seem to happen for all pages, and while I initially thought it was restricted to very old pages from before we moved to Miraheze or added Cargo, I've seen a few newer ones duplicate too.