Not sure that I understand what that means!
We left from platform 9b. Didn't get moved either.
That service is booked platform 5B, it must of been moved upon arrival from its forming service. 1M53 is not your service that is a
XC▸ to Manchester, which i'd imagine was running about 25 minutes late. This must of then been replatformed by the points failure, and as such caused other services to be replatformed - perhaps a service with a connection causing it to be held outside New Street and as such delay your departure.