Comment 3 for bug 1419563

I'm not sure there's a lot we can do - you can't re-map the keys (the obvious workaround) because they're sending identical codes. A quick google for "sonix usb keyboard linux" gives a number of similar/duplicate issues, with no resolution.

a) Try a different kernel version - this could be a regression on the kernel you're using, maybe try up/downgrading it.
b) Return the keyboard? (not sure this is possible, but I'd attempt to if it is) and buy a different one.