Wrong SEO title and Wrong Structured Data when Custom AMP front page is on

gistfile1.txt

// 12. Add Logo URL in the structured metadata
    add_filter( 'amp_post_template_metadata', 'ampforwp_update_metadata', 10, 2 );
    function ampforwp_update_metadata( $metadata, $post ) {
        global $redux_builder_amp;

        if (! empty( $redux_builder_amp['opt-media']['url'] ) ) {
          $structured_data_main_logo = $redux_builder_amp['opt-media']['url'];
        }

        if (! empty( $redux_builder_amp['amp-structured-data-logo']['url'] ) ) {
          $structured_data_logo = $redux_builder_amp['amp-structured-data-logo']['url'];
        }
        if ( $structured_data_logo ) {
          $structured_data_logo = $structured_data_logo;
        } else {
          $structured_data_logo = $structured_data_main_logo;
        }
        $metadata['publisher']['logo'] = array(
          '@type'   => 'ImageObject',
          'url'     =>  $structured_data_logo ,
          'height'  => 36,
          'width'   => 190,
        );

        //code for adding 'description' meta from Yoast SEO

        if($redux_builder_amp['ampforwp-seo-yoast-custom-description']){
         if ( class_exists('WPSEO_Frontend') ) {
           $front = WPSEO_Frontend::get_instance();
           $desc = $front->metadesc( false );
           if ( $desc ) {
             $metadata['description'] = $desc;
           }

           // Code for Custom Frontpage Yoast SEO Description 
           $post_id = $redux_builder_amp['amp-frontpage-select-option-pages'];
           if ( class_exists('WPSEO_Meta') ) {
             $custom_fp_desc = WPSEO_Meta::get_value('metadesc', $post_id );
             if ( is_home() && $redux_builder_amp['amp-frontpage-select-option'] ) {
               if ( $custom_fp_desc ) {
                 $metadata['description'] = $custom_fp_desc;
               } else {
                 unset( $metadata['description'] );
               }           
             }
           }
         }
        }
        //End of code for adding 'description' meta from Yoast SEO
        return $metadata;
    }


//26. Extending Title Tagand De-Hooking the Standard one from AMP
add_action('amp_post_template_include_single','ampforwp_remove_title_tags');
function ampforwp_remove_title_tags(){
  remove_action('amp_post_template_head','amp_post_template_add_title');
  add_action('amp_post_template_head','ampforwp_add_custom_title_tag');

  function ampforwp_add_custom_title_tag(){
    global $redux_builder_amp; ?>
    <title> <?php

      // title for a single post and single page
      if( is_single() || is_page() ){
        global $post;
        $title = $post->post_title;
        $site_title =  $title . ' | ' . get_option( 'blogname' ) ;
      }

      // title for archive pages
      if ( is_archive() && $redux_builder_amp['ampforwp-archive-support'] )  {
        $site_title = strip_tags(get_the_archive_title( '' )) . ' | ' . strip_tags(get_the_archive_description( '' ));
      }

      if ( is_home() ) {
        $site_title = get_bloginfo('name') . ' | ' . get_option( 'blogdescription' ) ;
        if  ( $redux_builder_amp['amp-frontpage-select-option']== 1) {
          $ID = $redux_builder_amp['amp-frontpage-select-option-pages'];
          $site_title =  get_the_title( $ID ) . ' | ' . get_option('blogname');
        } else {
          global $wp;
          $current_archive_url = home_url( $wp->request );
          $current_url_in_pieces = explode('/',$current_archive_url);
          $cnt = count($current_url_in_pieces);
          if( is_numeric( $current_url_in_pieces[  $cnt-1 ] ) ) {
            $site_title .= ' | Page '.$current_url_in_pieces[$cnt-1];
          }
        }
      }

      if( is_search() ) {
        $site_title =  $redux_builder_amp['amp-translator-search-text'] . '  ' . get_search_query();
      }

      if ( class_exists('WPSEO_Frontend') ) {
        $front = WPSEO_Frontend::get_instance();
        $title = $front->title( $site_title );

        // Code for Custom Frontpage Yoast SEO Title
        if ( class_exists('WPSEO_Meta') ) {

          // Yoast SEO Title
          $yaost_title = WPSEO_Options::get_option( 'wpseo' );
          if ( $yaost_title['website_name']) {
            $site_title  = $yaost_title['website_name'];
          } else {
            $site_title  =  get_bloginfo('name');
          }

          // Yoast SEO Title Seperator
          $wpseo_titles = WPSEO_Options::get_option( 'wpseo_titles' );
          $seperator_options = WPSEO_Option_Titles::get_instance()->get_separator_options();
          if ( $wpseo_titles['separator'] ) {
            $seperator = $seperator_options[ $wpseo_titles['separator'] ];
          } else {
            $seperator = ' - ';
          }

          $post_id = $redux_builder_amp['amp-frontpage-select-option-pages'];
          $custom_fp_title = WPSEO_Meta::get_value('title', $post_id );
          if ( is_home() && $redux_builder_amp['amp-frontpage-select-option'] ) {
            if ( $custom_fp_title ) {
              $title = $custom_fp_title;
            } else {
              $title = get_the_title($post_id) .' '. $seperator .' '. $site_title ;
            }
          }
        }

        echo $title;
      } else {
        echo $site_title;
      } ?>
    </title> <?php
  }
}