@sezare56 are you controlling syntakt with ot in that video?
The bug i came across was explained here. SYNTAKT Bugs Thread - #412 by avantronica
As well as SYNTAKT Bugs Thread - #396 by avantronica
OP see if the issue changes if you set syntakt’s param output to CC or NRPN…
Afaik there hasnt been a fix to that bug yet, I wouldnt be surprised if there were more issues with midi implementation that hadnt surfaced yet since the once mentioned above were tbh pretty careless and embarrassing mistakes for elektron to make.