OK, I’ve narrowed it down. It seems that the reCAPTCHA is disappearing once the Litespeed Caching plugin is activated and the forms won’t work. I have checked the logs and I could not find any reasons for the same. We had also tried to exclude those links but it doesn’t seem to help. I can provide logins for the site if you pm me. If Litespeed is disabled like it is now, all is fine.