I decided to test it for myself when you mentioned it out of curiosity, but it looks like it might be an isolated problem or browser/OS related, since I use Chrome on Windows 7. By the way, does this happen with other sites? Just curious. Either way, it's an interesting issue at the least. I hope it gets resolved.
Yesterday I noticed even though I had it set to keep me logged in, I got logged out...But it seems that that function is working today, so I'm not sure if I had a problem or just misclicked without realizing it last time. I'll try to keep a watch for any bugs still.
"I don't know what words I can say
The wind has a way to talk to me
Flowers sleep, a silent lullaby
I pray for reply
I'm ready"
-Melfina's Song