Sorting reverts after saving services pages

Hello and good day.

I have services on a services page.

I duplicated one of the services to create more subsequent service pages.

Those newer pages are added as the first pages and I want to sort them.

The sorting works, however, after I edit a service page, it reverts back to its original position as the first service page.

Saving the service seems to be the issue.

Am I doing something wrong?