Person Profile Type- Not able to make it inactive

Summary:

Hello everyone,

we have configured a Person Profile Type, using the "Skills" Template and adding "Recruiting" and "Skills Center" as subscribers. However, now we want to make this Profile inactive and we are unable to so , because the "Active" tick box cannot be unflagged.

Keep in mind that it is the first time that we have this issue with a profile; all the others can be deactivated.

We have also tried to remove "Skills Center" from the subscribers and we get an error message (see the screenshots below)

Which could be the reason for this and how can we overcome this issue?