What you were expecting to happen, and what actually happened: My normal XP per fight is 117. With this added 100% bonus, it’s usually more, but I’m getting the same 117 as without the bonus.
How often does this happen? When did it begin happening? The bonus is in effect during Guild Wars. It has not happened in the past and I just noticed it today.
Steps to make it happen again It’s consistent in Explore and PVP.