Hi @jaxxxk, could you share the link of the website, please. This will be very helpful to check what wrong with the widget.
I listed bellow some ideas, maybe will help you.
1. Please, remove the JS code you added.
2. The JS code which inits the lazyload and lightbox is in the js->instagram-widget.js file, check if it is loaded on the page.
3. The widget container should have classnames as “widget zoom-instagram-widget” sometimes the widget classname can be replaced by other plugins.