UI is not updated instead of using ObservableCollection

Question

I have a listbox that contains a bulk of items that can vary from 100-250 items depending on the navigation(items are not static,its dynamic).I am using an ObservableCollection to store the items.In the UI front there is an image in each item provided to add that item to cart which changes its color from transparent to green if clicked.there is another page where we can see the selected items.If I am deleting any item from the selected items and coming back to the previous page where I have the list of items,I don't see any changes in the UI front.i.e, the cart color is still green,it should change back from green to transparent.

How I can deal with this?