Won my first 8 rounds and finally trippled my wrath Weaver. When I played it the stats returned to the base 2/6… I thought it was a visual bug like the mama bear but nope… There goes the win streak 
Just had something similar happen. Was playing as Voljin and had 2 20+/20+ Wrath Weavers near the last few rounds. Made them golden and lost all the stats. Went down 11/15
Have a screenshot of it saying 22x Wrath Woven
The same happened to me today, looks like the bug is still there.