Thanks @jwoods. I followed link and installed wrtbwmon too to compare between them 
I cleaned all data for nlbwmon and wrtbwmon on main router. Let's see how much difference will become between them.
I also used to "vnstat" but it's interface is not user-friendly. I used YAMon too but it is not integrated with LuCi and caused high CPU load so I deleted it.
This topic is highly interested about nlbwmon; Why such a huge discrepancy between vnstat and nlbwmon's bandwidth stats
I don't understand what you mean with "reverse geolocation" @sycohexor 
Yes I use it for 4 months before LEDE.