Hello!

After each arena I get a fishing equipment buff for no reason and the addon doesn't remove it.

Thanks!

LTP doesn't remove the fishing buff because doing so cancels the fishing cast.

Report it as a bug using the in-game bug report tool. It seems that removing other buffs doesn't interrupt the fishing cast (including appearance change buffs from items and toys) so it's likely an oversight.

Guess we'll have to wait for Blizzard to fix that.