number of wrong lessons in curriculum

I’m trying to solve a very annoying problem.

I assign the lessons to the course, but the numbering of the lessons appears wrong:

https://ibb.co/GcDNfZZ

The lesson attributed to module 1 should have the number 1.1 and not 1.2!

The lesson attributed to module 2 should be number 2.1 and not 3.1.

I looked at the settings any option that would allow me to manage this, but I did not find it.

Do you know how I can solve this?

The page I need help with: [log in to see the link]