Magento

I am currently learning how to use Magento for the company I am working in, but unfortunately i’m encountering some errors, I edited the description in one product and then the image size in the list view increases.

http://www.adsis.co.uk/catalogsearch/result/?q=NP300E5A-A0KUK

there’s the product.

I still don’t know alot about Magento, but I can’t seem to find a fix, help would be highly appreciated.

Thanks