Sounds like a number of different issues here.
For channel 207 / 208, we will need to find out if the frequencies changed - I will need to look at the data mentioned here UK Scanning Issue - Losing Channels - #126 by asjmcguireplex
For the mismatch in number of channels picked = may be this is a usb2 / usb3 issue
I noticed that the 3 DVRs are 2 on USB 3 and 1 on USB 2
USB3
Jun 15, 2019 22:51:17.556 [0x7f6d767fc700] DEBUG - HTTP requesting GET http://127.0.0.1:32600/devices/compound_device093dvb#v4l#/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/usb3/3-1/3-1.1/3-1.1:1.0:0014024542/scanners
Jun 15, 2019 22:51:17.630 [0x7f6d767fc700] DEBUG - HTTP requesting GET http://127.0.0.1:32600/devices/compound_device093dvb#v4l#/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/usb3/3-1/3-1.2/3-1.2:1.0:0014020406/scanners
USB 2
Jun 15, 2019 22:51:17.697 [0x7f6d767fc700] DEBUG - HTTP requesting GET http://127.0.0.1:32600/devices/compound_device080dvb#v4l#/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.6/2-1.6:1.0:0014025207/scanners
Will continue tomorrow
