I have the default template and 2 others.

The categories that have the default template display clean images:

This is the one template's:

I found the problems.

 

In the style.css of the template you want to change you must do the following in the following block:

/* --- Sub-category block --- */

Just after: div.subCategory a.subCategoryImage:hover {text-align:center;display:block;}

add: div.subCategory a.subCategoryImage img {width: 290px;} - Change to whatever you want the width to be.

 

AND

 

In your global parameters change the category width to whatever you want it to be.