The image selected in film Strip is different than the one selected in Display view

Hello, 

I just switch from Lr6 to LrC10.2. 

I struggle with selecting image. When I simple click & double click an image in the FilmStrip , it shows in the Navigator, but not in the Library Display area. 

Instead, when I go in the Display area (in grid or loop mode), there is another image selected. It's like there is two different selections that are not synchronized.

I would like that when I click an image in the FilmStrip, this one to be selected and shown in the Display area. 

I have noticed, aswell, that in the develop mode, I have to double click each images in the Filmstrip in order to have them display in the Develop module. 

In LR6, in the Develop modul,  I just had to click an image once in order to access it and been able to treat it.

Is that normal? I am confused. 
Please help.