The page keep showing 'Loading Prismic Preview' over and over when hover to item

Hi guys, I am get a problem with Prismic Preview that when I hover to Services, it's supposed to be open a submenu like an image.
But when I'm in preview mode and I hover to Services, It keeps show the overlay 'Loading Prismic Preview', it did not show the submenu.
I wonder what is the condition for the overlay showing? or somehow I trigger that so it was showed the overlay?

Screen Shot 2021-06-03 at 17.33.22

Hey, this seems like something related to the front-end of the site. Is the content of the submenu also handled in Prismic?

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