Hi Ashley,

>>>>the objects and/or dimension lines have moved slightly within the viewport.

That is because not all objects in your drawing are on the same XY plane. If you will look at the drawing from the front direction, you will see:

Plus - in the "Electrical Locations" layout the view direction is not perpendicular to the XY plane, that is why some blocks are visually shifted.

If you will activate viewport in "Electrical Locations" layout and use PLAN command, then zoom back to the area you need to see, previously "shifted" objects will be in correct place.