I didn’t want to wait, so I’ve made a small change to search file.
OG:
<h1 class="page-title"><span class="page-title-text"><?php printf( esc_html__( 'Search Results: %s', 'siteorigin-unwind' ), get_search_query() ); ?></span></h1>
My file:
<h1 class="page-title"><span class="page-title-text"><?php esc_html_e( 'Search Results: ', 'siteorigin-unwind' ); ?><?php echo get_search_query(); ?></span></h1>
and now it works.