Jquery UI drag drop not working with custom helper - jquery-ui

I'm building simple video editor timeline, I have created custom helper to create new div to place on timeline, but when I drop it changing back to original HTML.
not sure, how to achieve this, so, it correctly placed on the timeline
here preview https://fiddle.jshell.net/surjitsidhu/28cca2w5/1/show/
it can be edited here https://fiddle.jshell.net/surjitsidhu/28cca2w5/1

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