Hello Ofi Khan,
Thanks for your answer!
It's true that on my 27" screen everything is ok, but not on my 15" macbook pro screen, thought it should be 3 columns.
If I try to resize my window on the 15" screen, the 3d column gets back to its right place, but if we arrive to this page from a link we can see the 3d column slips below (because the alt description of the image appears first on the 3d column but then it slips).
Proof here: https://prnt.sc/Z7wNb0kIBt7F
Here are my monitors caracteristics: https://prnt.sc/jNk78OwlnIHm
and the problem happens on my 15" macbook pro, whatever the navigator (Firefox, Safari, Google Chrome)
I don't understand and can't find what's wrong.
Please help!
Thanks