Sales tax and gift cards

I purchased a gift card from Victoria’s Secret today, and I noticed I was charged sales tax on the gift card.  This has never happened to me before, as tax is usually taken at the time of redemption for the gift card, not when the gift card is purchased.  I also purchased gift cards from American Eagle and Simon’s Mall today, and neither charged me sales tax on the card.  I’ve got an e-mail in with Vickie’s; I guess we’ll see what happens.

Has this happened to anyone else?  Is it normal?  Taxation and internet sales are often odd bedfellows, but I’m pretty sure this is wrong.  Anyone know for sure?