Break and enter skill bugged?

I looted and hacked a symbio graft today, a ql 113 one, soldier reflect, upon hacking the graft i was told i had lost 4415 xp. Naturally i was a little shocked, the graft was hacked as normal so that anyone could use, but having never lost exp before when hacking something i petitioned it. (still waiting on petiton currently).
Then later in the mission the MA in my team picked the lock on a door, i got the normal xp for such a thing but she lost 4500xp and the NT in the team lost 4100xp as a result of opening the door.

Seemed to be random because all the doors after that in the mission behaved normally, havent got another symbio graft to try that again.