Multiple links problem

I have exactly the same problem.

On the synced site, the page display breaks precisely when the first link starts.

Here’s an example : https://imgur.com/jxJyE0L

I had this problem as well, but I like the concept of the plugin so much that I spent some time fixing it.
It looks like there are a few problems in the code related to regular expressions primarily. I’ve got it working on my servers but I don’t make any claims that the changes I’m listing will work on all configurations.
For those of you who are programmers, you can try making the following 5 changes to the plugin’s wp-help.php file:

1) Remove the following:
public function convert_links_cb( $matches )

2) Replace this function with the following code:

private function convert_links($content) {
    $content = preg_replace_callback(
        '/href="[A-z0-9":\/.\-_\?=]*&[amp;]*document=([0-9]+)"/',
        function($matches) {
            return 'href="https://wp-help-link/' . $matches[1] . '"';
        }, $content);
    $admin_url = parse_url(admin_url('/'));
    $content = preg_replace('#(https?)://' . preg_quote($admin_url['host'] . $admin_url['path'], '#') . '#', '', $content);
    return $content;
}

3) Replace this function with the following code:

public function make_links_local_cb( $matches ) {
    $local_id = $this->local_id_from_slurp_id( absint($matches[1]) );
    if ($local_id) {
        return 'href="' . get_permalink(absint($local_id)) . '"';
    } else
        return $matches[0];
}

4) Replace this function with the following code:

private function make_links_local($content) {
    $output = preg_replace_callback(
        '/href="http:\/\/wp-help-link\/([0-9]+)"/',
        array($this, 'make_links_local_cb'),
        $content
    );
    return $output;
}

5) Change the visibility of this function to public instead of private as follows:
public function local_id_from_slurp_id( $id ) {