If this is the case, it's definitely a weird bug, as there is no logic which does this intentionally. I'll check it out.
It shouldn't do this on newer servers, I fixed this in 10.51, I believe.
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IMO a good way to "solve" this is if the looter was directly guided by the targeting, like:
Choose loot/don't loot on specific mobs
Choose loot first/loot last on specific mobs
;] ?