Glass documentation states that there are two ways to use the Editable method on Webforms.
<%= Editable(Model, x => x.Title) %> //explicitly stating the model <%= Editable(x => x.Title) %> //using the Model property
What I noticed is that the second one only works outside of the loop. For example, if I am on a detail page for an article and I need to render the title. But if I am in a foreach to display the article's three authors it displays the same data three times and it happens to be the data for the last item in the collection.
What I needed to do was to use the first method where the Model is explicitly passed.