Problem with my navigation menu

I’m having some really odd behavior on ma page.

I’m really not sure what I did for this to happen but every time I try to open my navigation menu (in preview) it won’t open it. Whereas it clearly appears in editor…

Here’s the read only link :

I would really appriceate it if someone could help me with that.
Even if I start again from the beginning (with a blank nabber) I have the same problem.

Thank you very much !

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