Need someone to fix CAPTCHA on a contact form


I have a custom contact form on a vBulletin forum that had CAPTCHA.

For some reason, the CAPTCHA disappeared and the contact form is not working without it, as I was told by numerous people trying to reach me.
SEMrush

I cannot figure it out, I need a professional developer to take a look.

Please PM me for more information and assessment of price for the fix.