CMC takes into account several prices from different exchanges and then gets an average price so you shouldn't expect the btc price on this site to 100% match with other exchanges. With that in mind, perhaps yesterday one of the exchanges glitched or something else happened which made CMC show a higher price (?).

To be honest, CMC has been accused of manipulating prices and display fake volume several times so i wouldn't be surprised if they messed with something yesterday.