Swipe screen to unlock??

Hi

My phone is setup with pattern unlock, with a 3 min relock time. However, once unlocked, if I turn the phone off and back on (standby like when you put it in your pocket), it always come up with a swipe screen and I have to swipe up. Never had to do this before with other phones, Note 4, S6 Edge Plus etc.. is this an AT&T 'feature'??

Thanks

Andy