Dropdown selection error

I have a problem with a dropdown selection in a form.The top option in the dropdown doesn’t work. When I select the top option, the text of “This section is required” appears. If I do not set the section required, the data will be registered without being selected.Does anyone know how to solve this problem?
Thank you in advance for your help!

Could you take a screenshot of it?

Thank you for your rep!
This is a movie fo the screen.
I have no idea how to slove this problem…

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