Replying to
@liaizon@wake.st I am very sorry about that.
This was a quite tricky bug to catch but I have probably squashed it.
You should have received at most only one additional like this afternoon and then not anymore (and I've already restarted the service multiple times). If you could confirm this then I'll put this bug to sleep 🙂
This was basically caused by Mastodon's implementation of tombstone events that forces me to re-create a different version of an activity if I decide to remove and re-create the reaction file with the same name.
But Mastodon interpreted that as a separate activity, so it ended up undoing and redoing the like upon initial sync.
Sorry again for the inconvenience.