Odd fluctuations while leveling.
Could it be fluctuations as you leve and your gear expires?
I’ve noticed that my Necromancer can easily keep gear for 10 levels and carve a bloody swath across the map. After being unable to ever do that with Engineer (I’ve never had anything but a terrible experience with engineer pve), it was quite a shock.
I upgrade gear at five level intervals on Engineer since I have the funding but, it is a possible contributor.
I have had the issue persist after going to the Tp and upgrading. The degree is naturally smaller though.
It’s not going to stop me from leveling Engineer unless it gets more severe. It is just an annoyance that I wasn’t prepared for.