Menu disappeares when I release the scrollbar

Hi, I just created a nice and pretty big responsive menu with your lovely plugin. Everything worked fine until I tried to use the scrollbar. After I moved the bar and released it (to click on a menu item) the menu minified back to the hamburger icon. I couldn’t click on any menu item down on this scroll menu.
I tried it using the developer tool on firefox and chrome.
What am I doing wrong?

Kind regards
Martin

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