Help!: Why does this site keep logging me out?

I find a couple of things extremely frustrating about dealing with this site. One is that when I've finished a map, even though I'm logged in, sometimes when I'm trying to save it takes me to the login page. On the login page, it both asks for my userid and password AND tells me that I'm already logged in, but the little "logout" option up top changes to "member login" so I no longer know what my condition is, and fear losing my map I'm trying to save.