I'm not versed in that software so, unfortunately, I cannot be of more help. The word "load" can be nebulous as I'm guessing it's not that simple as "plug and play". I used to mod NHL14 through a program called NHLView and it was never as simple as edit and then "load". Multiple steps were involved. I would have to assume that there are different things you do or don't do when doing a "load" of your roster. I'd recommend writing out the exact steps that you took so that anyone familiar, with this program, can maybe determine what you did incorrectly (and where/when). I recommend spelling out what you do in each software, start to finish.
Maybe someone here knows the software you are using and can advise.