These errors in your gnome-software log are suspicious:
09:31:07:0528 OSTree Ignoring remote ‘gnome’ due to no valid collection ID being configured for it: Remote "gnome" not found
09:31:07:0528 OSTree Ignoring remote ‘gnome-apps’ due to no valid collection ID being configured for it: Remote "gnome-apps" not found
But I don’t have a solution, sorry.