Domain linked to a cs-cart redirects to IFRAME error

I have 1 domain .com linked to a hosting and also I have 1 .net without any hosting linked but redirecting to the .com. (Redirection is configured in the cpanel)

When I try to see the website using the .net domain I get an error from explorer saying something like: “content cant be loaded in a IFRAME”

I have 3 cs-cart lisences and I havent had that problem before… Does someone know if it´s that a bug or what?