Difference in EXP while playing together

[DirtySiwy12]

Hello. I have an issue with my friend. We're playing from the beginnig together all the time. I mean seriously, always together. We reached lvl 73 and we noticed, that my friend (Paladin Tank) is 7% ahead of me (Priest, Healer) in exp. Why is that? We are doing same quests, same dungeons, we are in the party all the time, and we are doing same thing. Yet, that 7% is out there. Anyone have any idea how is that possible?

[t4d3y]

To level 73, alot of small XP differences can occur, for example, he is got more reseted XP, maybe discovered something on the map that you didn't, maybe you two were abit farther away from each other, thus only one got XP for a kill, etc. And tbh 7% at that level range is very little.

[DirtySiwy12]

The thing is that we only play together, and we are almost always close to each other, so we discover map and have rest in same amount.
EDIT: And we noticed it only recently, it's not like we have that much of a difference on lvl 60 for example, or 65.