image size controls for image galleries on pages do not work

@skandha Please take a look at my page here: https://www.axumcreative.com/selected-work/portraiture/ The images are full size when I don't want them to be. I want the settings to work for both thumbnail and medium size. The two setting on the page control section do not work. Also, how do I remove the date from the top of the page - this date is incorrect and not something I want to display, so how do I turn them off on the entire site and page by page? Please advise.