Hello Vince,
I was able to reproduce this issue on our end. I have written up a report ( UE-15885) and I have submitted it to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. Thank you for your information and time. The easiest workaround I have found so far is to create a function library and then to create a function that removes all widgets from the screen (as shown in a previous post). I would then call this function before changing levels. I hope that this helps. If you require any further assistance please let me know and I will be more than happy to help.
Example:
My Function library
My Call
Make it a great day