How to automatically increase the field "number" in CMS?

I created a help center some time ago, and i want the field number can increment automatically instead of manual, because of an issue when the list of items are sorted by upgraded or created. Take a look at the page:

https://help.postcenter.io/faq

the item number 7 is not in the right place. how can i fix that?

here is the read only link (go to “Preguntas Frecuentes” page):
https://preview.webflow.com/preview/postcenter-tutorials?preview=254d51957b2b5c8314fe35ef66b8ca77

Thank for the help