Question/Problem regarding my Benchmade Osborne 940

I own a BM Osborne 940, and I've run into a problem with it. It seems to have unsharpened itself. Now I know this happens a lot, as usually that's fine, and I'd put an edge back on it. The problem is, it won't take an edge. I'm using my Spyderco Tri-Angle Sharpmaker to sharpen my knives, and it works wonderfully on everything else, but it can't seem to put an edge back on my 940. Here's a picture of one of the problem areas. You can see light reflecting off of the edge at the base of the blade, which means it's obviously duller than dull. I do know that it's S30V steel, so it's pretty damn hard stuff, but I've been able to put an edge on my D2 bladed knives just fine with the Sharpmaker, so it shouldn't be a problem. I could use some advice on what I might be doing wrong, if anyone has any insight.