Ciao Eva,
come hai configurato il blocco?
Probabilmente a te serve configurarlo unico "di sistema" e non "di corso":
How to use one block for all courses?
In order to gather experience points from all the courses a student is participating in, you have to set the admin setting Where are experience points used? to 'For the whole site'. This setting is located under "Site administration > Plugins > Blocks > Level up! > General settings". Once set, any block newly or previously added will display the total experience points of your students.
HTH,
Matteo