I was pairing a centralite leak sensor yesterday and the zigbee pairing screen discovered two devices that surprised me. The two devices were both stuck at Initializing so I reset the centralite one and that paired correctly this time but same experience as @danabw that it was detected as contact sensor, not a big deal though since it was easy to switch.
Now I'm curious what the other device the hubitat hub detected when I was pairing, I don't see anything odd listed in my zigbee settings page.
I remember back in my Wemo days someone had a switch show up that wasn't there's and it took support to remove it from their account. They made a comment about how they kept turning it on and off thinking it was one of there's but nothing turned on. I laughed thinking that somebody somewhere probably thought they had a ghost.