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It is hard to know why an asset fluctuates so much, but we have to remember with Steem and Hive, that there is an infinite amount, and millions of new coins each day are being created via the website. So it's hard to see how something that has such an abundance can ever increase.

To be honest it's a miracle it's worth anything!

Cg.

There are people on exchanges buying and selling very frequently in an attempt to make some quick money. The very high volumes (i.e. 4 times the Hive market cap) is a strong indication that many of the sellers were buyers just a few hours earlier.