Your log also states:
Oct 16 09:46:11 venator Tor[3519]: Heartbeat: Accounting enabled. Sent: 5.42 MB, Received: 6.82 MB, Used: 6.90 MB / 48.00 GB, Rule: max. The current accounting interval ends on 2017-10-17 09:00:00, in 23:13 hours. 
...
Oct 16 14:45:03 venator Tor[3519]: Bandwidth soft limit reached; commencing hibernation. No new connections will be accepted  

Also notice that 192 + 48 = 240, which coinsides with your observed increase.

Yeah, I have noticed so it seems I should not enable obfs4 on my relays.
I misunderstood something somewhere. Disabling for now and going to learn more.

Thank you,