[2020] Auto Fire Bug (I don't want to use auto fire, but Epic obligates me to use it cause they patched the fire mode glitch) I've died ton of times cause of this stupid bug.

It looks like auto fire activated. When that happened you still had the dedicated button held down while it was taking Auto fire as the priority. You would have to let go of the button and press the dedicated button once auto fire stops. Using multiple fire methods at the same time can cause this issue.