I’ve had this happen a number of times, but I can’t tell if they really didn’t read or if Medium somehow didn’t pick up the read. There was a day when I had a lot more reads than views (weird, right?!) so I wonder if sometimes the system isn’t working properly. It sounds like though you’ve pinpointed this to a specific person though and the behavior keeps repeating. Baffling and frustrating when it’s reads that matter!