That'd be a community wide thing, not local, and dependent on the admins correcting it. I don't use those buttons, as everything is generally the same markup functionality as reddit uses via text.
There's a contact email address over at https://communities.win/ that you might try using to get the issue brought up in front of the eyes of someone who can fix that.
Not certain there really is any difference, outside of pretentious people wanting to sound smart and different.
To answer your other question - put a single * before and after the words you want italicized.
That'd be a community wide thing, not local, and dependent on the admins correcting it. I don't use those buttons, as everything is generally the same markup functionality as reddit uses via text.
There's a contact email address over at https://communities.win/ that you might try using to get the issue brought up in front of the eyes of someone who can fix that.