IPTables byte count inconsistent

Question

I have the following IPTables rules - basically to allow only 2 IP addresses to access the internet. These rules are on my home wifi router running DD-WRT.

Chain INPUT (policy ACCEPT 16114 packets, 1355844 bytes)
    pkts      bytes target     prot opt in     out     source               destination         
    1454   106133 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp dpt:ssh 

Chain FORWARD (policy DROP 0 packets, 0 bytes)
    pkts      bytes target     prot opt in     out     source               destination         
     257    14367 ACCEPT     0    --  any    any     anywhere             192.168.1.101       
     461    39776 ACCEPT     0    --  any    any     192.168.1.101        anywhere            
     513    57439 ACCEPT     0    --  any    any     anywhere             192.168.1.104       
     781    39507 ACCEPT     0    --  any    any     192.168.1.104        anywhere            

Chain OUTPUT (policy ACCEPT 12408 packets, 2700791 bytes)
    pkts      bytes target     prot opt in     out     source               destination         
    1055   186138 ACCEPT     tcp  --  any    any     anywhere             anywhere            tcp spt:ssh 

I also want to track the number of bytes received or transmitted by each of these 2 IPs.

I am looking at the Bytes column in iptables -vx -L FORWARD to know the bytes sent/received.

However the numbers in the Bytes column seems to be much less than what i expect. The above numbers have been recorded after downloading more than 10MB of data on 192.168.1.101. The downloaded byte count reads only 14KB.

Why does this difference exist? Is there something i am missing?