Wordpress Security Issue Troubleshooting

My website is accessible from my system but not from my client's. Despite checking with Sucuri and confirming that there's no malware and the site isn't blacklisted.

Showing medium risk with below URLs
TLS Recommendations
HTTPS mixed content found. Your HTTPS website is referring to an HTTP resource:
http://cdn.jsinit.directfwd.com/sk-jspark_init.php on https://lordscare.co.uk/.git/HEAD
http://cdn.jsinit.directfwd.com/sk-jspark_init.php on https://lordscare.co.uk/404javascript.js
http://cdn.jsinit.directfwd.com/sk-jspark_init.php on https://lordscare.co.uk/404testpage4525d2fdc

I need a professional with experience in diagnosing and resolving issues. Please note:

- No recent changes have been made to the website, so the problem isn't likely related to new content or code.

Your expertise in this matter is greatly appreciated.