Not quite sure how you got the two image banners on the same page, which I am guessing your post single view (full post)…however, in the Dynamic Widgets plugin, when you click on “Static or Dynamic” in the widget, it opens the dynamic widgets page to assign the widget to select locations. At the very top is this:
Set all options to ‘No’ (Except overriding options like Role, Date, etc.)
Click on “Set all options to No” and then select the pages or other locations to show the widget. This is assures the widget will first be disabled from being seen “everywhere” but gives you the option of then choosing what and where to show it.