I got caught by this a few weeks ago.
I went down to platform 1, and just missed a train.
I thought the next one would be in 15 minutes (14:03) , but the departure board said 14:18. So I (and quite a few other people) waited on Platform 1, and it was only just after 14:00 that I realised that the train was going from Platform 7. I made the train with seconds to spare, but there were several people who didn't.
I supposed I was to blame in that I shouldn't have assumed that all GOBLIN trains leave from Platform 1, but I do think that in these circumstances an announcement should be made to tell passengers that the next train is going from Platform 7.