Duplicate content in grid view due to PHP 5.2.13

Issue Summary

Got a really weird problem with the bonus grid view - I've created a 2 grid display for images on my homepage which essentially a view based on a content type called homepage image. So I'm currently making some changes to my site on my localhost before I upload it - I'm running it through mamp.
If the php is set to 5.2.13 I get a weird duplication of my grid content which messes up my page. If it's set to 5.3 it displays fine.

Any ideas of how to get round this as I need to run 5.2.13 as other sectiond of my site don't work on 5.3?
I attached an image of how it shoudn't be...