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I never got an answer via Twitter, but do the free months have anything to do with it? They shouldn't since some people are reporting higher amounts and they would have had some of the same free months (from game purchase and the month BioWare gave us in May). I have three free months from the original purchase of the game, the free month and a day BioWare gave us, and the free month when I applied the CE code in Aug; do we get coins for those free months?
I've been playing since early access with only one month where I let my sub lapse (June to July, I resubbed on July 30th) and my total is showing 1950 (collector's, one month at 200, five months at 150). I pay via time cards, if maybe that's somehow the issue.