Thanks for the clear answer !

It's because sometimes there is too much information to fit into the popup. The usual cause of this is an abundance of NOTAM all covering the same place. Turning off NOTAM display on the map will make the popup appear again.

On the computer, normally, just moving the pointer on the map the information appears, but sometimes nothing appears. I cannot realize why, it just happens. But the information appears on the virtual radar. Is there a way to parameterize this issue? Personally, I prefer when it appears only on the virtual radar, but I don't find a way to define this.