How do I fix level setting issue causing paint/sculpting not to work properly?

I already have an open world landscape drawn up, but I must have messed with a setting of some kind. when adding foilage in some areas of the map it puts it way up in the air and sideways as if its being drawn on an imaginary wall. When trying to smooth/sculpt the cursor is very fidgety on where it will allow even on flat areas. I have noticed one area of the map is still operating normally so I am assuming there is some map setting I must have messed up. Any advice is appreciated!
Thank You,