I honestly have absolutely no clue as to what went wrong nor do I have the faintest idea as to what could have gone wrong. Even new Characters created seem to do it as well 
Hello there.
In order to help out we need to understand what’s going on and to do that you will need to give as much information as you can. A video showing what the issue is might be a good start.
Was AI movement working fine before? What changes have you made recently that could cause this? Have you tried anything to get this fixed? How do you know it’s working incorrectly?
Edit: I just noticed 2nd post with the video.
Edit2: I will respond under 2nd post. here