Text box alignment in Adobe Portfolio

I have a page on my portfolio website where, for some reason, the text box modules do not fill the entire content area.

https://stormmcglashan.myportfolio.com/design-portfolio

The headers and descriptions for each of the sections within my design folio all have center aligned text, but the text box module itself does not fill the full content area and I don’t understand why. I have tried adding in new text boxes but the same thing happens. 

The same issue happens on my bookings page: https://stormmcglashan.myportfolio.com/bookings