Hello,

1. You need to check your host settings. Create the default form and try to test it to find out if the reason in host configuration or in the form configuration.

2. No, our support does not cover third parties plugins customization

3. Is this a plugin? Check the issue on some default theme to find out if our theme causes the problem.

4. However when we click on some icon or button in our site it may redirect to following link. == Seems this is kind of virus which you could bring with a plugin.

Best Regards