Hello @ignaciosantiago,
Thanks for writing in! Everything seems to be functioning exactly as you have it setup in the headers I’ve inspected in your installation. The one discrepancy I found was that in your Header Services header, you have the the following visibility attributes assigned to your two navigations:
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Navigation Inline is set to be hidden on extra small, small, and mediaum sized devices
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Navigation Modal is set to be hidden on extra large, large, and medium sized devices
As you can see, both of your navigations are set to be hidden on medium sized devices, which is creating an overlap where both are hidden at the same time for a while.
I was unable to recreate the issue you showed in your screenshot after looking around. The Navigation Inline element is disappearing for me on medium sized breakpoints as it should.
If you are still continuing to experience an issue with this, if you wouldn’t mind providing more explicit details so we can look into this further for you, but for the time being all appears to be functioning as it should.