[UPDATED] Why does my bluetooth keyboard's shift key function like backspace? (Android)

[Ron Obvious]

This is driving me nuts. My text messages keep backspacing over themselves, and it's hard to say anything intelligible. It didn't used to do this, so it's stuck in some sort of mode. Googling hasn't been helpful.

I don't think it's just the shift key either, as it seems my messages wipe themselves out when I don't type anything for a while either, but shift definitely backspaces every time.

This is on my Android phone.

Thanks in advance!

ETA: This is the left shift. It still works as a shift, though. The right shift produces a vertical bar.

UPDATE: Asked this question on the Amazon page for this product and immediately got a response from the manufacturer. We went back and forth a few times, and the manufacturer have now agreed to ship me a new unit.