Index file problem

[harrisc]

I set up a simple website for a relative 2 years ago. Everything works except the index page does not show any theme, the menu titles are shown in plain text as dot points. Every other page shows the them correctly. The them is Bootstrap3 although the same problem occurs with Cardinal & Innovation set as the theme.  I copied and pasted the text from the index page to a  new page and it shows the theme correctly, but I cannot set it as index.

How do I make the Index page show the theme?

Chris