Log in box for aol mail

[Animals4me]

Iam using aol mail although aol isn't my provider.Over the last week each time I wish to log in it is different.I used to only get a box in the left hand corner where you could tick to stay on line until I log off.Now more often than not I get a huge box where I don't need to tick anything and just type in my screen name and password.
Just wondered if anyone could tell me why this is happening now and the standard box isn't always appearing to begin with.Thanks.