Have you ever bought the same thing repeatedly? My DD and I have the same problem. I will think of something I need to buy, buy it, don't remove it from my memory and the next time I'm at the store I buy another one. Sometimes we wind up with 3 of the same thing before realizing we already have this. Another thing, I find myself buying the same shirt, fabric, pattern, whatever, over and over. I have 3 of the same blouse, bought at different times, if I liked it the first time, I will usually like it the next time I see it, buy it, not remembering that I already have it, have to laugh at yourself, oh, the joy of growing old.