Evohome not sticking to schedule.

I have this scenario where via the mobile app, no matter what schedule I set for a zone it always shows the target as 21c. Even when I delete all checkpoints it stays at 21c. All other zones act as they should, (currently at 10c until 17:00 where they are set to start coming on at around 29c)

I'm sure I'm missing something simple but I can't figure it out.

I think one mistake I have made is this room in question has two rads, and I use the controller as the temp sensor. But I have set it to multiroom zone.