I have never encountered anything like this. For the life of me can't figure out where they originated. They are not selectible and only appear in this drawing view. See attached pdf. There are 3 such dimensions. The easiest to spot is up high in the view, the other two are near the top of the mesh panels. The dimensions are also on a different scale. No items of the assembly are hidden. This model is the second of 2 configurations. Only 1 Config <1> sub-assembly is "supressed" in favor of the similar sub-assembly in Config <2>. Any ideas?