Exp-bug
 

Sometimes after i died i didnt get exp for some reason. Was hunting half an hour in a grp until i noticed i didnt get one piece of exp since i died. Happened about 3 times now. Was fixed by relogging. I met at least one other person with the same problen.

This happens because of the grouping bug. More often than not, if you zone while in a group, and you try to exp with them. You will not get exp until the group is reformed (safest bet). You weren't getting experience because the server wasn't technically recognizing you as a group member.