Wonder who made this mistake at WalMart?

Wife and I went shopping the other night at a WalMart Store in Kentucky. There are no taxes on food there. Going down our grocery list, I discovered that we needed coffee. Normally, I would buy my coffee only at Krogers. Since we were totally out, I thought I would buy a small can of coffee, until I made it to a Krogers store. In checking out the cans of coffee displayed, I saw something I still do not believe. On WalMarts shelves were cans of Kroger coffee! The Kroger emblem was right on the front of each can. What does this mean? Are WalMart and Krogers owned by the same people? Question: how did cans of Krogers coffee find their way to the shelves of WalMart?