Having problems staying signed into Safari on iPad

A little over a month ago or so, for some reason, something changed in my Safari on my iPad. My top bar(s) went from the light green to dark gray and now every time I open my iPad, I have to resign into Safari and Facebook. It will not keep me signed in. I do not have a problem with my iPhone or my Mac laptop. They are the same in appearance and stay signed in Safari and Facebook. I have compared the Settings between my phone and pad and the items that are listed the same are both set the same on both units. I can't delete Safari from my iPad and reinstall in hopes that would solve the problem. Does anyone out there have any idea what might be my problem. Even when I tell Safari to use the mobile site for signing in and to stay signed it, the next time I open my iPad, I have to sign in again. I am on IOS 8.3

Thanks

Sheri