When we create machines in Foreman I make sure that 'owner' is set to the relevant AD group so all members of this group can edit the host. But if a member of the group does edit the host, Foreman changes the owner from the group to the user - why?

Looking at the logs there's an 'update event' on 'owner_id' and 'owner_type', even though the only thing the user was doing was adding a puppetclass to the host.

2019-02-07T14:13:53 [I|app|e4b00] Current user set to a001538 (regular)
2019-02-07T14:13:53 [I|aud|e4b00] HostClass (2090) create event on puppetclass_id 232
2019-02-07T14:13:53 [I|aud|e4b00] HostClass (2090) create event on host_id 2999
2019-02-07T14:14:00 [I|app|e4b00] Processed 7 tasks from queue 'Host::Managed Main', completed 7/7
2019-02-07T14:14:00 [I|aud|e4b00] Host::Base (2999) update event on disk , 
2019-02-07T14:14:00 [I|aud|e4b00] Host::Base (2999) update event on owner_id 94, 1
2019-02-07T14:14:00 [I|aud|e4b00] Host::Base (2999) update event on owner_type Usergroup, User

So why is Foreman changing the owner of the host?