I'll have to describe this problem as don't have another camera on me to capture it visually, but imagine only half the WhatsApp icon appearing on the Always on Display for example, and when you tap to turn on the screen, you can see the notification's text box where the missing half of icon should be.
Pretty poor programming especially when the notification text isn't even meant to be visible on the AoD
Go get Good Lock and use the lockscreen app to modify the layout of the lockscreen and AOD. That might fix the overlap issue for you and in the meantime you can tweak the look of things the way you like. I changed the clock style and such as well.
