Why does my slow motion look so stuttery?

I attempted a funny cat video in slow motion, but the issue i have is even with blending frames, it has some terrible stuttering. What could be the reason?

Video: https://www.dropbox.com/s/cywoo9ohlwia8 … O.mp4?dl=0

Settings:
https://i.imgur.com/Fo3Urv8.png
https://i.imgur.com/IredYFT.png