With the 1.4.4 update, many weapons got new debuffs that inflict newer debuffs that were previously unable to be applied. This causes the game to kick you from the server, since you are adding a new debuff unable to be inflicted in 1.4.1 (the current server version). Here is the list of weapons that I am aware about that causes kicks :
Blood Butcher
Hel-fire
Cool Whip
Inferno Fork
Invalid projectile error (it deals damage in Survival but isn’t visible to other players, in PvP it shows that you did deal damage but you will get no damage from projectiles)
Nights Edge
True Nights Edge (Banned from PvP)
Excalibur
True Excalibur
Terra Blade (Banned from PvP, Works in zombies)
The Horseman’s Blade (Works in Zombies)
Please feel free to add any more weapons to this list here or in the comments.
Removed from list: