Theme or plugin that needs updating

Hello!
I have my shop at http://www.carlmanevent.se/shop/ or https://www.balloonia.se
I haven't been there for a while due to some incorrect proxy settings at work, but today this was solved.
When I went to my web shop today it looks really crazy!
The background is all black and the text and images looks totally scattered.

The interesting thing is though, that the page looks normal in my mobile phone.

My web hotel support suggest that the theme or some plugin needs updating. I run Zen Cart 1.5.1 and theme629.
The page looks weird both in IE and Chrome.

I don't know where to start though and am terrified to do any changes, since the page works fine on the mobile phone.

Is there any error log that I can look into that suggest what is wrong and where do I find it?
Thanks for all help

carlman:

Hello!
I have my shop at http://www.carlmanevent.se/shop/ or www.balloonia.se
I haven't been there for a while due to some incorrect proxy settings at work, but today this was solved.
When I went to my web shop today it looks really crazy!
The background is all black and the text and images looks totally scattered.

The interesting thing is though, that the page looks normal in my mobile phone.

My web hotel support suggest that the theme or some plugin needs updating. I run Zen Cart 1.5.1 and theme629.
The page looks weird both in IE and Chrome.

I don't know where to start though and am terrified to do any changes, since the page works fine on the mobile phone.

Is there any error log that I can look into that suggest what is wrong and where do I find it?
Thanks for all help

Where did you get that template ("theme") from?

Template Monster by any chance?

As an aside: you are running ZC 1.5.1, you should consider updating to the latest version.