I seem to have three copies of the abaddon set. I certainly don't recall buying it three times (though I suppose it's always possible I repeatedly forgot I already had it?), but I don't know if the issue is that my internet freaked out and caused a multi-buy or something where the FC got deducted, or if I just ended up with extra items at no charge.

From what I can see you actually brought the set 3 times.
One each on the 2nd, the 7th and the 31st of March.

Shame on me Thanks Firn