because I have removed debug mode.
see the video in hidden content area to see the error and when it's happening.
First you will see a bug when I save some actions from joomla backend, then on front-end I get this error :
0 Call to undefined method ScssPhp\ScssPhp\Compiler::setOutputStyle()
Then, I close the page and I open it again and the error has gone.
Then, when I edit again the page with SP page builder, you will see that joomla module addon has been cleared and my previous selection "test module", has been removed.
is it more clear?