Yeah, that is unusual. I don’t think I have ever had a credit card that worked that way, other than in the situation I described above, and I have had (and still have) many. I guess I was confused when you said you transferred a 0 balance which I thought meant a 0% balance. For me it would be grounds to immediately cancel the card, which I am generally loath to do since doing so means the amount of unused credit goes down which means your credit score does as well.
//i\\