My page is displayed using a different theme from the one that's applied to it, why?

Occassionally a page may display using a theme other than the one that has been applied to it. This occurs if a different theme has been loaded within the source of the article, therefore overwriting the original theme.

To check if this is the reason and fix the issue:

Open the article in question in the document editor.
On the 'contents' pae of the editor select the 'Source' button to view the article's source code.
At the top of the source code see if there's a line of code loading a specific theme - it'll look something like this:

<link rel="stylesheet" type="text/css" href="/Templates/ThemeAsCSS.aspx?theme_id=962&version=632706982730000000" />
Remove this line of code from the source and click 'OK' to return to the contents pane.
Check your article still looks ok and then click 'Save' to commit the change to your article.

Your article should now display using the correct theme on your website.