Please remove this CSS, you've added it in template files directly:

#primary {
    width: 950px;
}

Change it to something like this:

@media only screen and (min-width: 1200px){
     #primary {width: 73%;}
}

Trying to see your forums, i get Firefox blocking most of your topics because of mixed content (not secure).

@martin

Thanks Martin; i believe i was advised to do that for a previous issue i had, but can't recall where from (the theme support or here, probably the theme support :))

Kindest Regards,

@Massimod - could you expand a little on the "mixed content (not secure)"?

I use Firefox and have no issues, but only have a couple of forum areas open to "guests" but i'm sure you'd refer to it as that rather than the "not secure". I am curious and would like to resolve it; so please let me know what you mean,

Thanks for your assistance 🙂

Here: http://www.pesonline.co.uk/community/site-information-feedback/

The first topic is: http://www.pesonline.co.uk/community/site-information-feedback/on-site-chat/

And the second topic is: https://www.pesonline.co.uk/community/site-information-feedback/rocket-league-6th-may-2019/

So mixed content. http & https.

I think you should turn everything to https, since Chrome will block non secure pages next year.