Not fishy, this is what happens when someone starts buying up all the offers.
My comment is anecdotal. I meant that the amount bought is more that is what has been available in the past of constantly around 20btc. There is just under 20BTC available today after all that buying.
So I'm putting the thought out there that it maybe something like wash trading.
Dont think so, this Vincent still has all the rvn he bought in his account, currently more then 63.000.000 RVN, so no wash trading. He never sold, only bought more

But is he buying it from his or his own groups stash. Investigators is it possible to track the source of the RVN and see if they are connected?
Maybe "Vincent" is a Zambian with insider information....
"As part of the MOU, MLG has agreed to deliver to the Ministry certificates of title in digital and printed form by November 30, 2018 to serve as proof of concept for a systematic, streamlined process to scale up the country's land titling program.
Plans for the full scope of the project include developing a blockchain-based land titling program that includes a mobile platform and capabilities for mobile payments. The platform will accommodate streamlined regulations and data collection to assist future government decisions around city planning and land use."
BWTFDIK