M+ rating listed on the WoW armory pages do not match their in-game counter parts. For example, my character Sindolay-Zul’jin, is listed as receiving a rating of 125 points for a +15 timed Plaguefall run on the website. The rating is 187 in game. My total M+ rating at the time (1331) is listed correctly, but if you add up all the ratings listed for my runs on the armory page, it comes out to 889.
By no means is this an urgent bug, just wanted to bring attention to it nonetheless.