Because they're counting it as a debit and a credit. It doesn't even matter all that much what the dollar value is. It's the fact that you owe a debt - or the fact that you paid a debt.
I swear sometimes if you sneeze and they find out about it, you'll lose a couple of points the next day.
All in all though, your credit rating will fluctuate, but should stay within a range rather than always being on a specific number.
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