I bought 4 health potions from barter, and immediately went to use them on my wolves. But the health potions weren't there. It still took my mush, I just didn't get the potions.

I immediately went to use it on my wolves, so there's no way that all 4 got stollen in a 1 second range.

I have had that happen to me, but not with potions, food, every time I go for a hunt or buy food, it never appears.

Can you provide screenshots?

I didn't take any screenshots when it happened. I only noticed after I exited marketplace and went to give my wolves the potions, so then it was too late to take a screen shot for it :/ .

Your secretary bird will have a report on what your money has been spent on.

Ok! I'll go get that screenshot now

This was all that the secretary bird had from that day.

It doesn't look like the items were actually purchased, since you're not missing any money from buying four items

I think that it is included as one of the 41 items I bought for 2,550 mush or one of the 20 for 163 mush.