Suidobashi and the official child theme

Hello everybody!

I do have a question – if I can – on this Suidobashi theme customisation. Using your child theme, if I add a footer.php and an header.php file in the child-theme directory copied from the parent and modified by adding the Google Analytics and the Cookie Script code everything get messed up.

To be clear everything gets messed up even if the header and footer php file are simply copied and not modified.

Usually I make my child themes using the https://wordpress.org/plugins/orbisius-child-theme-creator/ plugin and this has never happened to me. This time I wanted to use the author’s default child-theme files and this is the result…

What’s the best behaviour to use them and make such modifications ?
Thanks in advance