Weldment drawing angle measurements problems using bill of materials

hello i have a weldment consisting of 3 box tube sections the top one is at a horizontal and the next 2 are legs but at a 49.7 degree angle when measured by me and when made up in the workshop but when i click table and add cut list angle 1 or 2 the angle shows up as 42 degrees is anyone else having issues with different measurements first hand to what the bill of materials says? i am on SW SP4.0 and using ISO 120x120x8 profile thanks