This happened only once to me - when I tried to order the Last Night in Soho steelbook. I forget exactly what happened, but I think I I tried to cancel and then reorder with other stuff, and it wouldn’t let me place the order again.
It’s some kind of a glitch with their system, that after a cancellation you (at least sometimes) can’t order the item again. If you create a second account, then you can purchase the steelbook. That’s what I did with LNiS.