Right Click advancement (bug?) on multiplayer

I have a custom tracker datapack, that enables the player to right click with it while in main- and offhand (with advancement detection). When in mainhand, it updates the tracker for the tracked player. When in offhand, it cycles through all players.
I tested everything in singleplayer and i didn't have any problems, but now on the server i want to use it on (purpur 1.21.5, Aternos) it behaves really weird. Sometimes when i right click (in main or offhand) it just keeps on updating/switching without me clicking anything until i right click again or switch out the item.
I have no idea why this is happening, i tested in singleplayer again and there is no issue.