Content incorrectly being duplicated on microsite

[Discovery_SA]

So bear with me here as this is probably a technical issue and i am not that technical.  We have a microsite for one of our partner organisations and recently we have detected that content from our main site appearing in the URLs for the microsite - both in search results and then when you click through to the SERP.  However, this content does not exist on the actual website at all. Anyone have a possible explanation for this?  I have tried searching the web but nothing.  I assume there is something in the set up of the microsite that is associating it with the content on the main site.

[Andy.Drinkwater]

Hi Lida,

Going to be a very awkward one to diagnose without seeing the sites and testing.

Is this on a Wordpress powered site? Is the content in the page source rather than actually on the page?

-Andy

[Discovery_SA]

Hi

Sorry - i understand i am confusing it.  Will try explain with an example.  So below is an exerpt from the SERPS.  The web address is correct (our microsite) but the title, page url and description are from a page on our other primary domain, one that does not even exist on the microsite.  When you click through, it seems to insert the page into the microsite domain.

Product enhancement 2016 - Discovery - Malcor medical aid scheme
https://www.malcormedicalaid.co.za/.../medical-aid-news-product-enhancements-201...
New product and benefit enhancements for 2016 ... Our enhancements include the new Smart Plan, access to personalised medicine and tailored benefits for ...

[Discovery_SA]

I would like to understand if this is a google indexing issue or is it a back-end dev issue?