I also have this problem, however I only have ever used 2.2.7. I was searching through Google to find a solution and found this post.
The controls have a huge delay input and it feels like they stick.
The other emulators such as FCEU GX, SNES9x GX work perfectly fine however.
I'm gonna buy another Series X, but can't decide if I should wait till the Xbox June event (maybe they get discounted) or just buy now. What do you guys think?