When using world coordinates on a project I found that most of the drawings overlaid exactly. However one kept coming in off the others when attaching against World UCS. World UCS set correctly and checking the actual coordinates (with ID point) everything checked out OK.
So what was the issue?
The issue was for some unknown reason the base of the drawing was not set to 0,0,0! It was rather wonky to be exact!
Type base to find out what the current drawing is set to. With pretty much any drawing but particularly world coordinate drawings is should be 0,0,0.
Wonky Base coordinates.
Base set correctly