Bonjour,
I actually do not understand why the Support contact is closed when in my opinion it is the way to report bugs. I guess that it is to prevent their box to explose with topics which have nothing to do with real bugs but waiting that the support contact re-opens and seeing staff answering so often in this forum is very frustrating for me particularly because they do not look to local ones. So because it seems to be, for the rest of the week, the normal way to report strange things,...
Using the Structure theme if you wish to articulate your posts using the titles polices proposed Title1, Title 2, ... Title 6 it looks exactly the way you wish in the visual editing box but as soon as you publish you post there are no more 6 kinds of titles but only 3 as you can see HERE
Could it be a little bug ?