My blog page displays a mixture of my PAGES

Hi There

since changing themes, my blog page displays a mixture of all my pages. Here’s the URL: http://www.musicproductioncourses.net/music-production-tips/

Before I switched themes, al my posts were nice visible ordered in date written. Now, all that is displayed is a mixture of all my pages chaotically organised! How did that happen?!

Here’s an example of one of my posts: http://www.musicproductioncourses.net/2010/02/logic-pro-studio-9-training-environment-layer-click-and-ports/

Thanks for reading and hope you can help!

Dave