is there any chance you have extensions running in your browser that might be interfering? does it appear correctly in an incognito window? it seems like this is maybe not a netlify issue.
Keep in mind that anyone else who runs an adblocker is going to have the same issue. This is then a usability issue you will need to remedy (people won’t turn off adblockers just to use the site necessarily.)
it actually happens very frequently that extensions cause very unpredictable behaviour~ you wouldn’t believe how many times people spend so much time debugging only for it to be a rogue extension that messes things up…
we always recommend testing with a clean browser or tab to be sure!