embed code error with zoho documents

Hi this error has been reported here https://help.zoho.com/portal/en/community/topic/embed-document-not-working signed off as fixed and now has reappeared :- (

I have this embed code <iframe width="500" height="400" frameborder="0" scrolling="no" src="https://docs.zoho.com/writer/published.do?rid=z1g2031dd7b6488914e9d8d3de9d1bfc13c63&mode=embed"></iframe>

which appears in this webpage
http://www.lovelocalfood.org.uk/index.php?/explore/learn/school_dinners1/

with a
document.write(' at the start of the embed
and a
'); at the end

Can you help please?
Thanks