Multiple instances of WSJTX

[VK2BPG]

I have installed two unique instances of WSJTX on my laptop, one for my 7610 and the other for my 9700 and run both at the same time when doing meteor scatter. I had something strange occur the last time I used both. The 9700 decode screen was decoding exactly the same signals as the 7610 screen. The only way I can see this happening is a problem with the USB ports in the laptop. The 7610 uses ports 3 and 4 while the 9700 uses ports 7 and 8. I really doubt the stations I was copying on 6m were running identical transmissions on 2m.  Has anyone else come across this?
I have resorted to only running one instance of WSJTX at a time now to avoid the problem.