WebHelp - Index Indentation Issue

Whilst looking at the generated index from my WebHelp output I have found that the sub-keywords have not been indented to the right as was laid out in my index pod on the RoboHelp project page.

Below is a sample of the Index I originally created:

Below is the generated WebHelp Index, notice there is no indentation at all:

Is there away I can show the indentations in my generated index? Any help would be greatly appreciated. I have only very recently started using RoboHelp so my apologies if this appears to be a simple fix!

Stuart