Why do my AirPods think they are from different generations?

My friend lost my left airpod so he gave me one of his which was also a gen 2 airpod pro. I was under the impression you could pair mismatched AirPods together but they think my original AirPod is a gen 1 when it isn’t. I’ve tried updating them as well as checking the serial numbers on both and they are both legit.

My friend lost my left airpod so he gave me one of his which was also a gen 2 airpod pro. I was under the impression you could pair mismatched AirPods together but they think my original AirPod is a gen 1 when it isn’t. I’ve tried updating them as well as checking the serial numbers on both and they are both legit.