Noticed this happening a few times, here's one example. I've seen it happening with a weapon equipped too (without any signifier that it was a fury bonus). Viewed the log both on my computer (chrome with TornTools enabled) and phone (sarfari, no scripts).
Somehow the attacker appears to punch me twice before I do an action, which shouldn't be possible I don't think? There's no filtering on the log. Not sure what the attacker actually saw on their end during the fight, if they had to actually punch twice or not.
ETA: here's a more interesting one, where the double attack turn happens mid-fight. I guess, is this a product of distraction? I didn't think it'd apply once there was only 1 attacker though.