My 2012 stock tires wore funky too, but they may have started to dry rot (most oem vehicle stock tires are not premium, and many are irregular.) Low air pressure will kill a set of tires quickly too. I got the next better grade of Dunlop RoadSmart 2 and they are wearing good so far with more miles than before, and still rolling.
If I can get premium Dunllop tires sized on my motorcycle, that's what I prefer usually. They handle good, are economical, and don't surprise me with defects when I least expect it (and my oem Dunlap's irregular wear did surprise me, but I'll never get those tires again.)