Swivel hips: sPL/PE1>IM

Hi,

This integrated mobility excersise (Swivel hips: sPL/PE1>IM) sais to keep the glutes on the ground at all times.
When i do this exercise and i go right with my legs, my left glute goes of the ground a bit and i really feel the stifness in the hip area. When i go to the left with my legs, the same story for the right glute. 

Does this mean i dont have the mobility yet?
And what else can i do to open up the hip mobiltiy?

Because i cant jump to the next exercise without completing this correct right???

In this post you can find almost everything you need to know about swivel hips. It has helped me a lot

https://www.gymnasticbodies.com/forum/topic/15200-finally-conquered-swivel-hips/?fromsearch=1

Thank you kindly