Archicad's GDL lamp is duplicating an element when adding "ROTY"

[mendezarcediego]

Help please! I've modified Archicad's "Spotlight Kit 25" Lamp object to rotate along its "Y" axis. But when I rotate it, one of its original elements gets duplicated, as if I made a copy as I was rotating.

The object from the screenshot has been rotated 15deg around its "y" axis and 15deg around its "x" axis.

FYI: I'm not a programer but I managed to add the new parameter to the interface and all, I just can't get this "duplicated" element to disappear, I'm sure I copy-pasted some code line without really understanding what it does and that is generating this issue. 

On a separate note, why can't I rotate around the Y axis by default?

[Kristian Bursell]

The way you have written that B = A argument seems a little convoluted. Typically I would write it like this:

    if ABS(B -A) < EPS