Different issue with challenge event


I am trying to play level 7 of the beginner tier event. I am getting the message that my green troop is too advanced for this tier but it won’t change it to a level 1 one star (as it did for the others - I don’t have any level 1 one star troops). I’ve completed the first 6 but now it won’t let me go any further and I’m not sure how to fix it. I can only put one screenshot so see below


9 posts were merged into an existing topic: [KNOWN ISSUE] December Challenge Event: can’t deselect high level troop