b) wrong size 4 or c) wrong size 4

[Léthalvenom]

Since today i noticed i m getting these 2 messages in my chat window when i m in a dungeon/raid killing stuff,doesn t happen when i m not in combat
b) wrong size 4
c) wrong size 4

Does any one know whats causing this? its just written and spamming in white in my chatbox.
Really don t have a clue whats causing this :S
Disabled and erased some saved variables allready after deleting new add-ons but it keeps appearing.