-- Don't just check that the options in the Mobo app are enabled, try toggling them off, check your lock screen to confirm they're off, and then toggle them back on again and recheck. Given the feature was working previously it could just be a one-off glitch.
-- What lock screen are you using? Have you tried disabling it and then re-enabling it to see if this clock feature comes back?
-- Do you have another app on your phone that actively shows you your phone's orientation? As an example, I have the 'GPS Status & Toolbox Pro' app installed, and when started it shows a compass displaying real-time orientation (direction and level) as I move my phone around. Since that clock's appearance is based on movement this might at least rule out a sensor failure. (odds are this is some kind of software-based issue that popped up, unlikely but not impossible to be a hardware one).