Purchases using Edge card credit. I haven't used this thing you call a "credit card" for years at GS due to always having lots of trade-in credit .
I think what happens is this (and it probably happens with CCs too, but they are probably better about clearing off the temporary hold) is this:
You order multiple games and a "temp hold" is put on your Edge card credit so you can't instantly make another order or in-store purchase and rip off GS. Fair enough - usually, the games ship nearly right away and that whole amount of the hold is used to cover that. Occasionally, though, a game or two gets held up. For whatever reason, this happened with a new copy of Star Ocean International. It shipped a couple of days later than the other games. So at that point what they apparently do is re-charge your Edge credit but without releasing the original remaining balance of the "temporary hold". Like I said before, when this happened last time the "temporary hold" was there for a month or two afterwards so it didn't look like it would clear on its own in a few days like it should (or like they may tell you).
sorry to take it off topic but nice Avernum avatar!