Lifter Failure

Well after installing my Comp.477 lift Hyd cam and lifter set and after proper assembly and break in period following Comp Cams instructions to a Tee I had a lifter fail. During the initial break in period with the idle at 2500 for 30 minutes the engine sounded great. Shut down for an hr and restarted and let it idle at around 1500 for 5 minutes and still sounded great. The next day running down the road and after about 10 miles started hearing lifter noise. By the time I got back home 20 miles later it was really rattling. The pic is what the lifter looked like when I pulled it out. It looks like the lifter was not rotating in the bore hole in which when installing and checking the movement we did rotate it slightly just to make sure it was free moving. So wondering why it did not rotate completely.lifter.jpg