@Salem90: To begin with, please double check that the AOD feature is switched off by swiping up from your Home screen > Settings > Lock screen and AOD > Always On Display > Make sure the switch to the right is greyed out, or tap on the words 'Always On Display' and make sure it says 'Off' at the top of the screen.
If it is, head to Settings > Modes and Routines, and check to see if any routines are set up which might enable the Always On Display under certain conditions.
Can you swipe down from the top of your screen into the quick panel and check that the AOD icon is off (greyed out).
