I agree. It seems odd. BUT (and this is just my opinion, of course) I believe there is a huuuge amount of BTC "tied up," so to speak, in the "dark web:" different markets there, if you catch my drift. Which is why "legitimate" charts aren't as legitimate as we may believe.
RE: Ripple, Cardano, Tron & RaiBlocks are now rated by CryptoRated