The text in your lock screen does appear to be messed up. It almost seems as if there's a non-visible image in the upper right side that's 'squishing' the type so it's not formatted properly. Since you referred to this problem as being an ongoing one, was it previously OK at one time? Can you recall any change you might have made or some update/upgrade that was applied right before this odd lock screen became obvious?
Have you already tried going into your Settings menu and looked into all the options in the Security/Lock screen menu? There could also be something buried in the Notifications menu since there might be options related to what personal info you can set to show in the lock screen. (Don't forget to delve into any contextual sub-menus and such that might be accessible in a menu's gear/hamburger/three-dot icon).