OK, I think I know what’s going on here but I don’t currently use the official Harmony/smart things integration smart app, so I can’t test it. But here’s what I think.
The official Harmony Connect smartapp now creates its own virtual switches
The current version of the official harmony connect smart app already creates a virtual switch for each of the activities. At least it’s supposed to. Those new virtual switches get a really strange name where [harmony] is appended to the end of the activity name. (Obviously whoever wrote this doesn’t have an echo.) those switches then show up in your things list. Not the activities, just the virtual switches. The activities only show up under the harmony.
You can see in your screenshots that those are switches because of the icon that they have which is an on button.
your own virtual switches
If you are creating your own virtual switches through the IDE or through one of the smart apps that create virtual switches, they should also show up in the things list under whatever name you gave them, although they may have a different icon depending on the device type you selected.
your missing activities
My guess, although again it’s only a guess because I haven’t tested it, is that you may have added harmony activities after you initially connected the hub to SmartThings. If so, you haven’t gone through the official process to create the virtual switches for those activities.
If those activities did exist at the time you connected the hub, maybe it only makes switches for the first four. That would be a bug, though.
Ordinarily you could try removing the harmony hub and then re-adding it, but I can’t recommend that at this time because people have had problems with re-adding hubs recently.
So I would suggest either just making your own virtual switches for the missing activities and associating them individually, or waiting until you contact support@smartthings.com to see what they suggest. I just don’t want you to lose any functionality you currently have which is why am not suggesting changing names or anything.
But the main thing to understand right now is that what you are seeing in the things list are the virtual switches which have been associated with Harmony activities. Not the harmony activities themselves. So you have 14 harmony activities, but only four Virtual switches to go with them. It’s the virtual switches that are missing, not the activities.
Good luck, let us know what you find out.