Top category has a larger font

Hi,

It seems that you edited the file "listing_img_desc" of the view "category" in order to have a h1 tag for the first category of the listing and the normal h2 tag for the other categories after that.
OR, there is a plugin which does that on your website.

In any case, you can edit the file www.pssgpcshop.com/templates/mouse/css/styles.css of your template and change the code:
h1 {
font-size: 20px;
}

to:
h1 {
font-size: 18px;
}

and they will have the same font size.