I see, so it is actually a change in the theme (I was afraid it was some error in my website). I’ve just changed to the original theme (not the child theme) and the “zoom” effect disapeared. So I think I’ll just make a new child theme.
Is the additional menu on top part of those changes too?
No worries @xyno. I’ll ask in the theme support forum.
Thanks for your answer @xyno
I’ve tried deactivating the lastest plugins I’ve installed and it was the same. But what called my attention is that the colors of the main menu are reverted to the originals. So it is maybe something related to the Base WP theme? Should I ask directly to the developer then?