Just out of curiosity, is it normal for Torishop items to already be in my inventory before I bought anything?

And if so is it normal for them to disappear 2 days later for no reason?
And if not...uh...forget I said anything...hah, but no really just take note that it happened I guess. I had like 4 items in the torishop, just like acid limbs and cheap stuff, and 2 days later they were gone.