I have a Deluge (USB) as sync master and on my Midihub I see the LED on each Midi port flashing on every quarter note the way I have distributed the clock via virtual pipes (filtered --only clock!)
On Midi Port A the flashing is in sync too but shifted once I did start/stop
(Only when I freshly startup my whole setup all ports are in unshifted sync)
Problem is: When I run a drum pattern on MIDI A it gets hickups on every quarter note random shifted on top.