Originally Posted by
themp
Ahhh, never mind. I remounted it, as I had taken it off to examine before posting here, and all is well now. I am confused on what happened but thanks for the input Andy and FBinNY.
FWIW mounting wheels not fully seated in dropouts is fairly common. Especially when working with the bike in a repair stand.
Best practice is to mount wheels with bike on the floor, so gravity ensures they're fully seated to the tops of the dropouts. Or, mount them on the stand, but move to floor and open and retighten QRs before any brake adjustments.