Is this speculation that Shared Access Memory is causing two logical devices appear? Have you toggled this on and off to confirm the scenario?
Here is a latest video on it. YouTube
https://youtu.be/xd6qTNvWsKgNote: My next steps today are the following
1) Run continuous for 2 hours against a pool and validate shares/hashrate
2) Test same config using 1x to 16x riser to see if SAM works same on riser
3) Test Power Usage at these rates, see about powerplay tweaking on what we can get out of it.