I've just tried it for a random journey and it did.But it didn't ...
What day(s)/time(s) are you looking at?
It would be best if you posted this as a separate thread as I am unsure how this relates to Burton to Sutton Coldfield (which was issued correctly as multiple tickets as a through ticket was not valid for travel via Birmingham).
What we really need is the full itinerary (if a return journey, please provide it in both directions) along with the dates of travels, and also any relevant railcards etc.