I'm new here and put this question on another section before realising it should be here.

I have an ecommerce website and decided to put some of my inventory on Froggle (first time I have tried Froogle).

Everything went well until I tried to login. I got a security warning telling me that the security of the website I was being directed to was insecure. Something about the website address being different to the one the certificate was issued to.

Has this happened to anyone else? And what causes this to happen?

Thank you in advance.