Today, during the war, I did not move even a single stone after my heroes opened their special skills, but their mana were completed again. The heroes I used were elena, azlar, and marjana … after the three of them opened their special skills, they mana were filled again.
Has something like this happened to you? 
Did they used their skills? Heroes like Miki can block using special for few turns
No, the mana of those 3 heroes is filled again after I opened the special skill. The opponent didn’t have Miki either