That's weird that it would show up in het x het breedings only, no reason I can see why that would happen.
Afterall, the only difference between a 100% het and a 66% het is that it is that the 66%er needs to be proven out. A het is a het, %s are just likelihood.
I seem to recall a thread many months ago discussing a line of albinos that hets hatched out visually different in color.. pics were included, I seem to recall that the hets had a different color to them. However the visual difference disappeared after a shed or two. Or maybe I'm just confused and remembering something wrong.