Yes, ever since I've had my babies, I've lost count and track of small things such as meeting a person a few times here and there, names, all sorts of stuff. You life maybe more chaotic then usuual, and may have just lettin go of the memory of meeting these people. It does happen, and is actually typical. Don't feel bad, just try to pay a little extra attention when meeting people, sometimes I have to take notes in my head like names, age, and where they are from.