Problem with the menu header, I see a + and a - symbols

Hello,

maelleapp.com

I have been seeign this strange header of my website.

Even if it looks like this in the editor of elementor:

I don't know the reason by I see this + and - symbols. Anything familiar to you?

the meny without the sub menu:


If I create a sub menu then I see the + and - symbols.

What are they?

My theme is twenty twenty one.

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