This is what I ended up doing to resolve the problem.
function properid() {
global $wp;
$url = home_url( $wp->request );
$correct_post_id = url_to_postid( $url );
return $correct_post_id; // returns post id for current post
}

i spent a couple hours pulling my hair out trying to figure out why my string was empty before realizing it was getting the template id and not the post id, here is a work around i’m using

function metavalue() {
global $wp;
$url = home_url( $wp->request );
$correct_post_id = url_to_postid( $url );
return $correct_post_id; // returns post id for current post
}
hope it works for ya, good luck.

i have the same issue, i can confirm that get_the_ID(); the_id(); $post->ID; will all return the template ID not the ID of the actual post.