When you add a "Wait for Exists" step from the Step Builder, against existing element in the Elements Explore, it will keep the image that was captured during the recording of that element.

That image is used as a backup logic to try and find the target element for the "Wait for Exists" step, but it should not be used. 

The workaround is to delete the image in the target element only for the "Wait for Exists" step.