Auto-formation when combat initiates results in needing a turn to get in range for an attack

Why is it that when combats initiates my two mages and ranger fall in line behind my Knight - sometimes in single file? I've noticed that Bairdotr runs all the way back at the end of the line to where I have to spend an entire turn to get in range of an attack. I also have to move the others so she's not hitting them.

I'm only level 3 and still in Cyseal, so I don't have much going on with gear and whatnot but this is really aggravating. Is this a bug or just the AI formation working as intended?