No visual mode on Editor

I reactivate the cache plugin, delete the cache, switch the cache off, deactivate the plugin.
Still got the issue.

I discover it happens only with the child theme, not the complete one.

Ok, I found it depends on the fuctions.php file of the child theme.
I have this code inside:

<?php

add_action('avia_builder_mode', "builder_set_debug");
function builder_set_debug()
{
	return "debug";
}

function add_custom_target(){
?>
<style>.sort_by_cat {
  display: table !important;
  margin: 0 auto !important;
}</style>
<?php
}
add_action('wp_footer', 'add_custom_target');

add_filter('clean_url','async_js',11);
function async_js($url) {
      if ( false !== strpos( $url, 'jquery.js' ) || false === strpos( $url, '.js' )) {
          return $url;
      }
      return "$url' defer='defer";        
} 

function defer_parsing_of_js ( $url ) {
if ( FALSE === strpos( $url, '.js' ) ) return $url;
if ( strpos( $url, 'jquery.js' ) ) return $url;
return "$url' defer ";
}
add_filter( 'clean_url', 'defer_parsing_of_js', 11, 1 );

Still need for support.
It’s a real shame.