Could someone explain to me what the “Cryptocurrency Spot Netflow Statistics” table on Coin Glass actually means?

I am looking at this table here; https://www.coinglass.com/spot-inflow-outflow. I have two questions. Do the negative red numbers mean that the tokens being withdrawn from the exchanges, meaning that whales are accumulating or does it mean the opposite of that? Secondly, if I were to take the 15 day net flow and divide by the market cap, how come that does not reconcile with the Netflow/Mcap ratio found when I click a specific token, right under the heat map? I am looking at the Spot charts not the futures