Rig floats in air with rig builder

I dont know why this is happening.

7918111--1010260--rig.PNG

Is your rig humanoid?

If so, have a look at this thread: https://discussions.unity.com/t/833975

Maybe try a newer version of Unity (as described in the first post) and see if it fixes your issue. If it doesn't, log us a bug using the Unity bug reporter.