Your disconnect period started during your "Anytime Bytes" period with you having 8GB of Token Data available and you still had the same 8 GB of Token Bytes available upon reconnection. That means that no data was used between your 5:47 PM disconnect and 2:00 AM when any usage would have been deducted from you Bonus Bytes.
Your Bonus Bytes period started at 2:00 AM and continued until 8:00 AM. You started the period with only 146 MB having been used at that point and still had only used 146 MB upon reconnection. Therefore no data had been consumed during that period either.
On that basis one must conclude that the data loss is occurring on your end of the network.
My suggestion is to disconnect your router entirely during this troubleshooting phase and connect a single computer directly to the Hughes modem.
On that single computer download and install GlassWire:
Use the following as a guide to set up Glasswire :
(click on picture for larger image)
GlassWire will then display what programs and processes were running and how much data they used and when.
The time of usage is displayed at the bottom:
Monitor your usage in this way for several days.
This will tell us if there is "something" on this computer or not.
If yes, it will be identified and we can take steps to curb its usage.
If no, then we need to delve further into your router, its settings and finally what devices are connecting wirelessly.