Wow, I went to post on the OpenWRT forum and couldn't log in only to discover it's gone! That's a sad bit of history there 
I've noticed recently while looking into my vnstat and Bandwidth Montior numbers that they're obnoxiously consistently wrong. Not sure what happend with BM but it seems to never show more than a few hundred meg per device on the network (it shows traffic on all devices, but never a meaningful amount.)
vnstat seems slightly more believable, but it's showing 480GB on a period I'm certain I've pulled well over 2TB, maybe over 4TB, all on the WAN interface. I suppose it's a minor issue, but since it was a very heavy usage moth due to some one time downloads I was curious to check bandwidth to make sure I haven't used too much unlimited, and discovered that all the reports are freakishly low.
Are there any known issues with these tools chronically under-reporting in LEDE Reboot?