Diablo® III

so heres my issue.

i was on the website a few minutes ago and then i moved off it and i decide to come back to read the forum and i notice im no longer logged in to teh forum i didnt think it was a big deal so i just click the green area where your forum posting toon is and click login and the pop up comes up.

but i cant type in the fields for username and password iv been having this issue since they changed the site to mists.

anyway so i figured id try going to the diablo 3 site and logging and and seeing if i could login their but when i get their im already logged in so my question is why did it keep me logged in over their but not on wow site.

correct me if im wrong but shouldnt both sites been logged out not just one