Who Would Wear These?
There are some people with one foot bigger than the other to the point that they need to wear different shoe sizes. Perhaps that is what happened here, but we can’t be sure.
It could also be that the only box the store had left of the shoes was a pair of seven and a half and an eight. Someone out there is wearing the mismatched pair. So, do you track them down in an attempt to rejoin your new pair of mismatched shoes? Or do you give it up, and move on to a new pair? Well, I guess it depends on how much you like those shoes.