Death Howl Bug: Invisible Death Howls

Hello everyone, I've got some (14 T^T) Death Howls bugged in a battle in The Hidden Vale. The battle is in the center of the map, exactly upon the Sacred Grove in the south.

Howls bugged in battle in Hidden Vale, the one pointed.

I've lose that battle, returned to the Sacred Grove to refill the HP but once I've battled again the Howls aren't visible and even if I win the match I didn't get the Howls back.
Anytime I return to the battle, the turns passes I see the Howls counter but never gaining back.
Does anyone encount the same bug? Is there anything that I can do?