It may have been the thicker portion of white, there's the thin albumin and the thick albumin, there may have even been a second glob of thick albumin. By definition, yolk is the yellow internal part of the egg, rich in protein and fat. If it's clear, it's not yolk. Even if it had membrane around it, it was still white.
I've been getting the exact opposite.... tiny eggs that are all yolk...no white at all. Comments anyone? Pullet sized eggs with jumbo yolks. just one hen doing this I think, either a welsummer or a brahma cross.