The two different categories both have different product types in, the one that is having the layout issues only include the product_unit product type with an id of "8" and the other products all display fine. This leads me to believe it is one of the template files for the product_units product type that is causing the issue.

I just cant think for the life of me what the product_unit template file will be that is causing the issue as has all been changed quite a bit. I do have a backup where I feel I might have to start comparing files to see what is different and see if I can find what has changed this way.

Many thanks,
Daniel