Upgraded test project from latest 2018 LTS to 2019.2.6 squishes player character

Hello,

I have a small test project that mainly contains off my Player character. Player character has an avatar and mixamo animations. All work fine in latest version of Unity 2018 LTS. I upgraded the project as a test to see if it would work fine in Unity 2019.2.6 and it seems it doesn't.
When not running the game in editor everything looks fine (first screen), when hitting play the player character becomes "squished". I don't have that much experience with Unity and I'm a bit at a loss at what to check to check and resolve this issue.



Any advise is welcome!
Thanks