The oddest thing. I am using the Fresh template, the Feed page, the one with the Instagram widget. I enter the username I am interested in but I get a different user Instagram page. I added a temporary page in the template where I placed the Instagram widget, here I entered the username I want and with this page I do get the correct Instragram feed, so I think it is not the widget but something else. I tried entering a few usernames in the "real" page, the one from the theme, and it works fine, yet with this particular username I get a different and real instagram feed.