DannyVarley:
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
The main "driving" file would most likely be: tpl_product_unit_default.php if in a non-rewritten uri the main_page parameter = product_unit_info. This file would be expected to be found in the override folder for your template: includes/templates/YOUR_TEMPLATE/templates/tpl_product_unit_default.php
From/within that file, it would call on other things as well, which would/could contribute to the issue...
But there could also be something in the header_php.php file or other files loaded in that directory (all ending with .php will be loaded) associated with that product type: includes/modules/pages/product_unit
Didn't capture the post, but if you have a working copy and a broke copy, pull out your trusted comparison tool such as winmerge, beyond compare, etc... (Beyond compare offers live-site to live-site comparison).