Berserker skill combo - Headbutt , Knee kick(Ultimate storming beast) is bugged. It doesnt activate the knee kick right away its delayed almost by 1 second. This prevents a berserker doing Headbutt, Knee kick , Ultimate evasion  which is a core movement combo. It works on XBOX fine.  Look at these clips ,

first is ps4

https://www.youtube.com/watch?v=hve6LAs4VYc
second is xbox
https://www.youtube.com/watch?v=TVoWOwGuIwQ