Duplicating post

Hello there,

I’ve set up a couple of CF, both text fields, for a page with a specific template. Everything works fine untill I duplicate a page, for pages with same layout. The duplicated page comes with blank CF, but in the front end I can see the CF from the original page. If I fill the fields on the duplicate page nothing changes on the front end, I still see the old values, Looking at the database, the postmeta table where this values are recorded, I noticed that for the same post_id I have duplicated CF. So the front end takes the value from one row, while the back end edit the duplicated row.
I have the last version of WP 6.4.3 and the last versione of the plugin 2.6.5. Is this a bug or something that happend just with my configuration?

Thanks