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Definitely sounds like a rollover issue. You can try re-binding your fret buttons to different keys. There's certain patterns of keys on crappy keyboards that can't be pressed together.

You could a ...

It's a standard Alps switch.

There's a guide on the RB side - You need to put a piece of tape on the white plastic part of the switch. I did it with my GH5tar and it's been working fine ever since.
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