Thanks for the vid. Not as obvious as in the other posted vid, but do see some shakiness. I don't think it is the adapter, but the 2 paddles are on 2 separate inputs, so would be possible for there to be an adapter problem that only affects one paddle.
A vid on what to expect (using AtGames Flashback 8 paddles) -
http://2600-daptor.com/VID20240216092020.mp4
The server that 2600-daptor is hosted on is throttled, so down-load and watch off your device to avoid video buffering.
Happy to swap adapters with you if you like, though would really be surprised if this is the adapter.
EDIT: Just to add, this is Stella 6.7.1 and Win 11 x64.
Tom
http://2600-daptor.com/