It seems I am not crazy, nor am I the only one this has happened too.
Some have pointed out that the Colt traded Mk18 is a DX model. Well the URL of the page I ordered it off of goes like this;
https://(retailer).com/product/colt-mk18-mod-1-fde-dx/
I've emailed and will give the retailer the opportunity to correct the problem, because this seems more and more like switcheroo to me.