I am trying to access the login page of this website https://www.myravensdown.co.nz/ .  But it comes up with  security error in Firefox. But it doesn't in Chrome or Edge. Anyone know if there is anything on this website that could be causing security error in Firefox. I have also tried it on multiple computers. When speaking to the company, they said they had talked to their website people who said it was fine and secure. But they had also had other people who had contacted them .

Looking at it in more depth, the certificate looks to have a probelm

https://www.myravensdown.co.nz/ Peer's Certificate issuer is not recognized. HTTP Strict Transport Security: false HTTP Public Key Pinning: false

Is this a problem that the website people they use should know about and fix?

TIA