Some Buttons are not functioning after publishing the file

I'm working on Storyline 2.0,  It has 4 layers and it has 4 buttons for viewing those layers. Another button is there for returning to main menu. After viewing all the layers, the return button is not working to move back to main menu. I have viewed the course both in LMS and local storage. Both places I'm facing that problem. I even imported in new file but it's not working. I'm viewing on google chrome and storyline 2.0 is of latest version.

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