Multiple meta values for same meta_key adding on “Preview Changes” hit but not on saving or updating post

Actually I’d love to have an answer from @ialocin, because he suggested me the way. But as the code is a bit long for comment field I’m posting it here as an answer. But I’d love to accept an answer more appropriate to the situation:

After @ialocin’s suggestion, I got that, the $post_id wasn’t accurate for a Preview Changes hit, so the $existing_locations wasn’t getting the correct db info. Now I changed the following line:

$existing_locations = get_post_custom_values( "{$project_prefix}post_locations", $post_id );

into the following conditional lines:

if( $_POST[ 'wp-preview' ] === 'dopreview' ) {
    //if it's a preview hit, grab the actual post's data
    $actual_post_id     = wp_get_post_parent_id( $post_id );
    $existing_locations = get_post_custom_values( "{$project_prefix}post_locations", $actual_post_id );
} else {
    //else, go with the actual post
    $existing_locations = get_post_custom_values( "{$project_prefix}post_locations", $post_id );
}

Everything is working as expected in localhost. Though sometimes, the Preview hit fails the preview_id and preview_nonce etc. and doesn’t show the preview, but when they’re set, the preview is, exactly what it should be.

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