I’m not a HA user, but I do read all the posts and try to keep a good idea of how it works, so I can I support people.
The original / first time HA scans your Velbus network, it can take ages to fully read the bus.
My advice you be
Setup a TCP gateway for the Velbus USB device, so that every bit of software can connect via TCP, instead of swapping the USB cable each time you do anything.
Search this forum for
When that is setup, confirm it’s operating correctly by connecting Velbuslink, scan your network to confirm.
Open the Logging tab, so that you can see all the bus activity.
Wipe your HA’s Velbus entries
Point HA to your localhost TCP port and start a scan.
Don’t touch anything else
Take your family out for dinner / theatre / county park & have a lovely time with them.
When you come back, maybe HA will have finished it’s scan and you can then go looking for all the visible and hidden Velbus entities.
Don’t touch HA until your happy that all of your Velbus modules have been interacted with by HA, by reviewing the Velbuslink log.
Save the log so that if you need assistance, you have some hard data to share 
Good luck.