Thread:Extension talk:Flow/Appearance on WM 1.22 (css error ? )

The extension doesn't look good on my local wikimedia 1.22. I am a developer and I feel like I have downloaded a wrong version.

Attached is the screenshot of Flow from Download Extension Distributor 1.22

I have tried the one from Git clone but it requires Mantle (then even with Mantle it gave many weird errors).

Any idea for me ?