I don't know what you guys are seeing but it seems to be back to normal now. CMC probably included/excluded some exchanges on the markets tab of certain coins/tokens hence there was a huge fluctuations in price.
it should be a warning for all that coinmarketcap manipulated the prices by defining where a legit transaction happened and where not.
I'm not going to defend coinmarketcap here, but CMC sure can do anything they can want to their charts. The reason they excluded some exchanges is because of some of these exchanges having no fees, hence they could easily fake the volume of some coins/tokens. Though people need to understand that CMC isn't the only site for coin/token prices.
~snip~
Or the other reason it maybe because of the larger bitcoin correction? I just heard it from news article in the past few hours and I think this is the reason of the price fluctuate but when checking it with live chart from bitcoinwisdom and cryptowat.ch I don't see a big fluctuate in few minutes or hours so this is only CMC glitch.
Bitcoin correcting in price shouldn't likely end up causing ETH to rise 20% in price though. So yeah, definitely something's wrong.