But I have never seen it before...
I was gathering leather with my garg knife.....
Most of the time I open the corpse, loot stuff THEN carve it for leathers...
But on a bull. I carved the corpse before opening it.....And I got a double stack of leathers appear outside the gump....(see image)

I don't think it makes any impact on anything....Its just that I have never seen it before....I tried it on a few animals, its always the same...
if I open it first its fine...If I carve it closed I get the wierd image...and ONLY with the garg knife