Not really. If you click on the NH person and then click on anything else, the conversation balloon will appear over your current target. It's has to be a product of how ARK handles the placement of the balloons. I suspect it assumes that if you are talking to an NPC that you will remain targeted on the NPC. I've had this happen to me many times when I forget to pay attention or my finger slips.
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Remembering Tyneetryk
Phaedreas Tears - 15 years old and first(*) of true neutral guilds in Atys.
(*) This statement is contested, but we are certainly the longest lasting.
<clowns | me & you | jokers>