Bug - Completely Negated Attacks

I have encountered what I am pretty sure is a bug. While fighting a trio of Imlings (I forget the subspecies now, Valve or something, I think), my creatures started attacking them, with absolutely no effect. No dodge pop up, no damage tick, nothing at all. The Imlings had no buffs, no artifact traits, and we’re not fused. They had not cast any spells. The attack animation played over the enemy sprite, then nothing. For more than a hundred rounds, holding down the turbo button on my gamepad, I tried to hit them (my damage output was sufficient to one-shot them, if I actually connected). Every single swing was either a dodge (which at least made sense), or another of these strangely negated hits.