There are occasions where a nearby player making a kill with a weapon, will record a kill for you via that weapon, also. I'm not sure if it does that anymore, but it was at least possible in the past.
It won't bug your account. Gjallarhorn is just a very rare drop.
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Thanks for the quick reply. Lately, I have seen it drop 8 times within the past 2 weeks for 6 of the ppl I run with. Two of the drops were duplicates for players recieving in the previous week. All of the players were XMAS guardians and the "founders" are still searching :) Just, found it odd and wanted to ask the question, in hopes I didn't screw myself. Thanks