Copying renames Parameters

[lemiant]

I have created a rounded triangle pattern to decrease weight, whose dimensions are controlled by user parameters (d50 = TriBase, d51 = TriHeight, etc.). However, whenever I copy the triangle, instead of the new dimensions referencing the correct user parameters (d53 = TriBase, d54 = TriHeight), it creates new unnamed user parameters for the dimensions to reference (d53 = d55, d54 = d56). How can I copy the triangle while still referencing the same user parameters?

I have posted a CAD here (http://host.codingproject.net/Side_Plate_R2.1.ipt) with the original (middle), a copy made by remaking the triangle (right), this is what I would like the copy to be, and one actually made by copying (left).