Sites webpart not showing all sites in the hub

Hi there

A few days ago I created a parent hub, and associated some sites.

Then I made those sites a second level hub, and associated sites to the second level.

In the second level hub sites, I created a sites web part to show all sites in the hub. But it only chooses one, or maybe 3 to 4 but not all of the sites.

I have the permission to add sites to the hubs.

I put in a call to Microsoft, heard back after 2 days which they said they would go away and find an answer and I've not heard back.

Is there a particular method to doing this. Eg. Should I go back to the Admin Centre, disassociated sites, unregister hubs then redo it all in a particular order? (not preferred option) or is there another way I can get the sites web part to render sites.

Thanks in advance.