Looking through your trades and wagering an educated guess:
You donated to the site roughly 7 months ago. (Thanks for that btw <3)
Donating changes your name to the purple it is now as compared to the Gold you had prior. I'd assume that trades don't live-check your name color/status but keep whatever was applicable when they were created. That'd explain why you don't have any "Gold trades" younger than 7 months and no "purple trades" older than 7 months. You do have both, purple and Gold in the "7 month" frame though so I'd assume you donated in that 7th month, between those two trades.
@Teebling care to comment/confirm my guess?
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