Finding an AirTag or error?

My iPhone discovered an AirTag that appears to be somewhere in my house…I’ve spent all kinds of time trying to find it and can’t. It showed up two days ago, and I can see a direct line (red dotted) where it came from, and it makes no sense (perfectly straight as the crow flies) and I have no correlation to where it appears to have come from. No other iPhones in our house see it - just mine. I can’t ping it either. Anyone able to help me figure this out?