Did you lube the bearing between then?
When I got my used CZM8 it would do the same thing, come flying up right after I threw the whip forward. I swapped the bearing to a clean center trac and the problem was gone.
I did lube the bearing actually , to make it more responsive. After half hour, I realised I didn’t need the extra response though, so I’ve ordered a fresh bearing along with another throw.
Would the extra response be making it bind? If so, I guess the problem will go with the new bearing.
Is your string tension perfect? If not then you might be hitting both parts of the string to create a simple whip bind. Make sure that you keep that loop open wide and take it slow. You should get it.