Why does my kamado ceramic grill fall out of it's stand when I open it?
The nest for the Egg should fit snugly in the grill, and you should never get the sense that it is tipping or sliding when opening the lid. If this is the case, then either the nest was not properly assembled, or it is not the correct nest for your grill.

You should contact Big Green Egg corporate with your issue. It may behoove you to take pictures, and offer to e-mail them to the rep that is assigned to your issue. You should also mention the name of the distributor, as I am sure the manufacturer would want to know if their product and brand are being represented poorly.

That will probably bring resolution to your problem. You can also bring your issue to their online community: http://eggheadforum.com/