To reproduce:
1. Open users attached project "ShotPro AssetBundle Pjt.zip"
2. Select "Standing Up" asset from Project folder
3. In the Inspector window play the animation in the preview window

Expected result: animation is played correctly without any jittering or fiddly animations
Actual result: animation starts to spasm out

Notes:
If Rig > Animation Type is changed from Humanoid to Generic, the jittering is fixed

Reproduced on:
2017.4.0f1 2017.4.19f1 2018.3.3f1 2019.1.0a15 2019.2.0a2

Notes:
According to the user, the animation is imported from Mixamo