Child Theme Acting Very Odd On Real Estate Responsive theme

Basically what I want is to change the colours from burgundy to blue as per the RT here https://rt1.wlthemes.com/?skin=realestate_red

But as soon as you use the non CSS options to change it then the theme get stuffed up. Instead of rounded header bar it becomes one wide blue line.

To fix it is another story as I have to reset colours, re-activate the parent theme, check colours, and then re-activate the child theme with the colour blue picked from the colour picker in the mother theme.

But as soon as I use the non css option to change the menu buttons it gets stuffed again.

Here’s a short video to explain the issue https://www.screencast.com/t/abPTmuhHBQH

I have opened a ticket but thought I could share it here for others.