Unwanted grey box


I've created a number of simple quiz slides in my course that just check for understand but don't get reported etc. However, when the course is published and the Correct/Incorrect layer is shown, a grey box also appears (see centre of attached image). [I have altered the image to hide certain information.] This box is not visible in Storyline on any layer or the slide/feedback master.

Help would be greatly appreciated!

Thanks, Brian


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