website ads on mobile phone

Hi,

I have been having problems on one of the sites that I manage. Basically when someone goes into the site from a computer it works perfectly fine but when one tries to go on the same site via the web browser than on top of the website header, there will be ads.

I tried to restore from a backup but they are all like that apart from a backup from last February which is impossible to use since a lot of changes have been done since then.

How can I go about removing those ads please?

Regards,
Matt

The page I need help with: [log in to see the link]