Bug? Showing all HTML tags within [php][/php] code?

Hi there!

Until last week it was all working fine… Now my code snippets show a lot of
and <p> tags in the middle of PHP?

Example on front-end:

******************

// add Jetpack sharing above single product page tabs</p>
<p>add_action(‘woocommerce_single_product_summary’,’addshare’, 33);
function addshare(){
remove_filter( ‘the_content’, ‘sharing_display’, 19 );
remove_filter( ‘the_excerpt’, ‘sharing_display’, 19 );
echo sharing_display();
}
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https://ww.wp.xz.cn/plugins/syntaxhighlighter/