Cookies pop up appearing then disappearing


I’ve added a cookies pop up to my site that should appear full screen and then disappear once the user agrees or disagrees on the form, when previewing the site in the creator it appears, however when looking on the published site, it either doesn’t appear, or flashes up on screen for less than a second. Can anyone let me know as to why this is happening?

Here is my site Read-Only: (Webflow - Learnify website V2 - Responsive layout)