Same Code Centers on Category Pages not home Page

I’m presently working on a clients website (Responsive theme, woocommerce) http://wedding-event-centerpieces.com/

If you scroll down that page you will notice that the caption of the different categories isn’t centered even though I centered it in CSS on my child theme’s style sheet.

The same code also applies to this page http://wedding-event-centerpieces.com/product-category/lanterns/ and it’s perfectly aligned.

What could be the problem?