Problem with Lights in the scene

Good Morning Everyone,
Sorry bothering but i have a problem with my Project.

I have 45 lights in my scene, but now, 13 of them are grey in the label menu on the right, and unselectable, even if i see them (G pressed) and even if they have the red X on them.

Anyone can help my with this problem? i’m sure it’s my mistake.
(I’ve uploaded a screenshot)