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There are a couple things I have found to cause that. In the case of that video it is a squad of S units being knocked apart. Clicking between these units still targets the squad. The more common and frustrating one I've encountered is when one of the units you have selected is being mind controlled (by a twilight mindweaver) In that case you always get the attack icon when controlling the entire group. Removing the mind controlled unit from your selection resolves this.