i play in the same guild as Onfire and this bug has just happened to me too.
Chatting with Onfire we think the issue might be caused by going back and recruiting heros missed in royal challenge AFTER you have recruited Ezek. We both did this.
For the record Onfire did get his 2nd sub back. After a long time trying to get a response from tynon then Evony, he then pm'ed Admins on heros charge forum and issue was fixed straight away.
Looks like all support is focused on heros charge now.
i myself have raised a tynon support ticket, but expect no joy there, and will try Onfire's approach to get some attention.