if you ran SW's autofix on an upload, the model is changed. otherwise it's as you uploaded, even the same format as you uploaded. You can check this using the download button after you upload a file. you will get a zip file containing the original file you uploaded. If you used autofix, you get an X3D file.
however it's never exactly WYSIYG, as the printer resolution is not nearly as high as your display. And you are printing smaller than the displayed size. Same effect as rescaling down a bitmap image: pixels get resampled and details get lost. The orange print is what I'd expect from your first screencap, since colored nylon prints are polished, the process will reduce small details and make everything look rounded. There's no possible way a polishing process will enhance details since polishing removes material starting at the highest points, exactly the opposite of enhancing details.
Print orientation also plays a role. The test print was printed with large flat side down, you can try setting orientation so it's side ways with one of the edges down. It can give better results on gradual slopes and curves like much of your terrain.
last factor is material, SLS has minimum feature size of 0.2mm, although for practical purposes it's closer to 0.5~0.7mm. Anything raised details than 0.5mm may not consistently print, and would certainly be lost during polishing.