Interesting, thing is I had the weird hand thing during an OBE before I even read anything about it so in my case it wasn't expectation. At least the first time it wasn't.

With numbers, that sounds more plausible... but then I wonder why you don't often see people with 4 arms and 3 legs, cats with 5 legs.. etc. Or why hands on DCs are not messed up looking.

I wonder if this is somehow linked to many people reporting looking in a mirror and seeing themselves as distorted. Maybe it's less to do with processing issues in the mind and more to do with the ego construct or something.