Damage and XP randomly stops

Hey, Logged in after the Bug fixes and decided to start from scratch so did the PTR copy and rebirthed the same toon, jumped in a T1 rift and got to level 9 pretty quickly, found a goblin and chased it down and from then on, hardly any progression and it was like I was on T16.
Nothing was dying, except me.
After about my 3rd death I lowered to Master and couldn’t even touch the RG’s health.

Left game, re started, killed about 30 things and almost levelled up before I encountered another Goblin, I again stopped doing damage.