I have also had this issue and I'm pretty sure it was a setting in Retroarch for that core which wasn't immediately obvious.
Not sure if my current gpu can run Retroarch but I will look if it runs.
Hello Hyperspinners
I am very glad to announce that we have had a new moderator join the ranks of our quiet community, you may have seen him around and he is @Spawk! 🎉✨
Spawk has been with us for 9 years and is always helping people out and a great contributor to our community. Our good friend Aorin contacted me with the suggestion and I wholeheartedly agreed, so thank you Aorin.
Cheers
giga