This failure is only for logged in user as me as admin.
Using Yandex maps when I try to create a new list, system is tahn trying to update the last listing and showing a broken site (without layout).
But for unlogged user it works properly and create a new listing.
Only using open street map is in both cases OK.
Google map is to complicate for me with its APIs and so...
I prefere Yandex but in this case I have to use Openstreet ;o(