bitrot:
This has happened that last two or three times that I have purchased Callaway Tour i(s) ball packs. The quantity selected is one (verified) but two packs are purchased. This is definately a big bug and annoying because it messes up my available credits. Please fix immediately.
Cheers.
This has happened to me a few times also. You may be double clicking the purchase button. Every time you click the button, the quantity you entered will be deleted from your account.