Ok, so I have discovered something that sheds light on this.
It's been in the bottle a week now. I gently picked the bottles up and held them (upright) to light --- there is yeast floating around everywhere!!! There's even a yeast ring at the neck of some of the bottles.
I have not brewed a lot (probably 20 batches now - almost all wyeast of different strains), but I have never seen this before
I did not cold crash prior to bottling (never do).
Aside from a different strain of yeast, the only thing different I did was use an "ale pale" instead of a "mr beer keg"