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.
I had read about it, was it true at the end? I don't really see the kind of manipulation that can be done by changing prices on CMC,
Yes, there were reports before on how they manipulated the price few times and how buggy they were. CMC isn't really a viable source of price but if you have been used to it, don't rely on their stats and always check other sources for volumes too.
CoinMarketCaps Fake Data Problem; Facebooks Libra ScamsFake Trading Volume on Exchanges and CoinmarketcapIt has to understand that CMC price is totally a freak and misleading info.
Anyway, I'm not very considerate with the price at CMC cause I actually visited into a certain my favorite exchange, only I used CMC just to know what exchanges who offer a trades with some of my altcoins and not the price itself. It is something to think that bugs really affecting into CMC and this problem may cause troubles and doubts especially to newcomers which particularly never know exactly about how it works.