[OpenLayers-Users] Incorrect tile order when sending GetMap requests with cookies

[Gis Mage]

Hi list,

I'm having an issue when trying to GetMap from geoserver, which is a
partner app for JOSSO auth system.
I get the response from server, but tiles are shown on the map in the
wrong order.

Here's the example:
http://77.37.206.10/josso/
Here's the example for 2.12 (master):
http://77.37.206.10/josso212/

The most strangest thing is that when I inspect div elements of the
map in firebug, I can see the right tiles in the position, where they
should be drawn.
Is this a bug?
How can it be fixed?