Restricted Navigation is off. But navigation is still restricted for several sections...

Hello all. I wondered if anyone could help? I am having some issues with restricted navigation in a Rise 360 course that I am developing with a colleague.

The course is split into 5 sections and we are working collaboratively on these sections. 

We have turned off restricted navigation from within the theme settings, with the aim of turning it on when the course is published. But it only works for the top 2 sections. The other 3 sections are all still be restricted!

We have tried clearing the browser CACHE with no success.

Has anyone else ever experienced this and know how to resolve this issue? Any help or tips would be greatly appreciated.

Many thanks,

Alex.