Conflict with Nitobe theme

I am using the Nitobe theme on my site, and have added the sheetnode module. On safari I found the spreadsheet displayed but the spreadsheet had a big gap between the input box row and the rest of the spreadsheet which overwrote itself over the input boxes (author info, published etc) so impossible to edit. I opened it up in chrome and it worked fine - as it did also in Internet Explorer. In firefox nothing was displayed at all although on looking at source all the data is there.

When I tried Garland theme on Safari (the other browsers I have had a fellow member of our organisation take a look at ) it displays correctly- although not great on I.E.

Not sure if this issue is a Sheetnode or Nitobe issue so I m posting on both pages (hope that is the correct protocol)

Thanks

Paul