Archaludon Ex Ability Assemble Alloy just breaks

I was playing a match against a Charizard player and went to use the ability of Archaludon Ex's Assemble Alloy. It gave me the prompt to choose 2 metal energy. Afterward, it says to select a metal Pokemon to attach said energies to. It would not let me attach energy to anything. The energies just did small animations when I clicked on them. The timer appeared, so I conceded the match.

Has this happened to anyone else? It has to be a bug of some sort.