Amazon Region Codes !!??

[wm58]

The last month or two I've been seeing more & more notices on blu-ray pages @ amazon warning of incompatible region encoding, for example:

Region 22436 encoding (This DVD will not play on most DVD players sold in the US or Canada [Region 1]. This item requires a region specific or multi-region DVD player and compatible TV. More about DVD formats.)

on this page

http://www.amazon.com/Unbreakable-Blu-ray-Bruce-Willis/dp/B00121QGV8

but this is just one example of many.

I've contacted Amazon, and of course they don't have a clue.

Does anyone know what is going on with these warnings?
I mean, for one thing, it's a DVD warning on a blu-ray page,
and for another, what kind of code is 22436?

I've purchased many blu-ray discs with this notice and can notice no diff.