Just a thought, but do you have access to a Win 7 computer as well? Win 10 is known to have problems with saber recognition, no matter if it's Emerald, Obsidian or Diamond. It often has to do with the specific hardware and software environment which might prevent proper recognition.
For me, it works prefectly fine on Win 10 (Obsidian and Emerald - no Diamond saber), so I would definitely try a Win 7 as well and see if the problem persists.
Can you post pictures of the main tab and the sound tab? Or maybe a step-by-step in pictures, beginning with the main tab so that I can identify possible error sources
Are both sabers Diamond sabers? If so, I'd like to move this topic to the Diamond Database - if you don't mind