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Update:
Contacted Betty in the Heroes Charge community forum. No joy.
Posted in the forum (by creating a dummy account), got a response from her and a few hours later, my problem was fixed.

Thanks. I think it's because I went back and recruited a hero in Royal Challenge that I hadn't bothered beating before.
Have logged a support ticket and will add to the newer forums too

I just had exactly the same happen to me today - did you find a solution?