4
It's because the Total column is not the cumulate sum of the column Count but of the column Amount. In your example, at the line for price 1612, Total=6.0 and indeed if you do the sum of all amount of the price above 1612 it gives you : 0.3+1.2+1.7+2.8 = 6
1
Count:
This is the total number of orders at that level. A count of 1 means that 1 order is at that price point. A count of 6 would mean that there are 6 orders at that price point.
From https://support.bitfinex.com/hc/en-us/articles/115003284889-Order-Book-Terms
2Count refers to the total numbers of orders. 1 means only one order at that price level, 15 would mean there are 15 orders at that price level. – m1xolyd1an – 2017-05-13T19:25:54.477