The latest version of Sync for Lemmy (released March 2024) has a bug where attempts to report Private Messages create reports for random comments instead - it creates a report for whatever comment has the same database ID as the private message you're trying to report (which on most instances will be a very old comment, since there are many more comments than private messages).

So: if you're using Sync for Lemmy, unless/until there is a new release of it, please refrain from reporting PMs while using it, to avoid filling instance admins' report queues with spurious reports.

There has been a bit of PM spam lately; please do report PM spam using other clients, so that admins can ban those accounts asap.

If you're interested in trying other Lemmy apps which hopefully get updates more frequently, there is a list of them here: https://join-lemmy.org/apps/