I have also noticed that they will only display the currently active reservation which rather makes displaying where they're reserved to pointless. On Sunday I was travelling EUS-COV and my seat displayed "Reserved to MKC" so I was relieved when no one asked me to move and thought I was safe. Then at MKC one of the passengers joining asked me to move and I noticed the display had changed to "Reserved to Manchester". Would be much better imo to combine the reservations and simply state "Reserved to Manchester" from the beginning. Or even better remove the fake compulsory reservations flag and it should be easier to find an unreserved seat.
^^^^This^^^^
Happended to me on a Cross Country from Bristol TM to Sheffield last week. I couldn't get a reservation at booking time a few days before, nor with a cheeky ask at the booking office at TM before departure.
On a (always) busy 5-car service, I found a "reserved to Bristol Parkway" seat with no one sitting in it, then noticed this changed to "reserved from Birmingham New Street" after departure from Parkway. The reservation notifications then went blank in the whole coach before arrival at New Street. which lead to the usual mix of passive/agressive and achingly polite British behavious in these circumstances, but I managed to hold onto my seat.
To add to the mix, there appeared to be 3 people with the same reservation for one of the seats in front of me.