It looks like the duplicator doesn’t handle the variations well, the background color was set to var(--global-color-11), but during the duplicating process, the color changes to var(u002du002dglobal-color-11) which is an invalid value.
You’ll have to manually assign the button color once the new page is duplicated, or you can try copying all content from the original post and pasting it into a new page, here’s a video for your reference.
https://youtube.com/watch?v=CsT1UOzZUgI&si=EnSIkaIECMiOmarE