Hello,
I realised in more than 3 Games,that when the Enemy plays Lorekeeper Polkelt, my own deck gets visual shuffeld. But I guess it should be the enemys deck.
Maybe it’s just for me, but I saw this in nearly 4 Games. So it’s only the animation.
Hope this might help!
Have a great day 
Can confirm, seen this as well plenty of times. Has no effect on the game really, but just looks weird.