Hi Steve,
Firstly apologies we haven't received an email from yourself regarding this.
It seems you may be looking at cached pages, in order to see the latest topics/replies you need to refresh the page, regular clearing of browsing history and cached pages can combat this issue. It's very easy on an iPad to return to already visited tabs as it doesn't get shut down like on a computer, to ensure you're looking at the most up to date data make sure to refesh the page.
Are you seeing the same problem on other boards?