Separator pages are enabled by default on your bundle and will add a page at the start of each section containing the section title and colour.
To disable this, first open the bundle properties by selecting the bundle metadata underneath the bundle title.
This will open up the bundle properties on the right-hand side, where you can toggle separator pages on and off.
If you've already generated your bundle before changing these settings, please regenerate your bundle again for the changes to take effect.