Layout problem


I am working on a new layout for a clients site and for some reason and i cannot find where this being controlled but the site has now got a column on the right side of the site. Can anyone point me in the right direction please?

the site is

Kind Regards

Hey there,
I hope you’re doing well today

This is strange, indeed.
Have you made any modifications to the theme files or custom CSS?
When exactly did this issue start occurring?

Best Regards,