Can’t display dimenstion from center of a foreshortened dimension to a line.

I tried to make dimensions from a center of a foreshortened dimension to varoius line. But  it only work with the  dimension 825.35. The dimension 775.05 isn’t displayed as I want; one point of the dimension line is at the  horizontal line , the other point is not at center point . Does anyone know how to fix this problem, thank you