Well, for some, a Sona is a representation of yourself (the one who created said Sona). So, for some, they only have 1 Sona, while the rest of their characters are just OCs (Original Characters). So basically he is asking if it is weird that his Fursona (the one that represents himself, on a more personal level) is the opposite gender. Which it is not. For something to be classified as 'weird', it would have to be uncommon. And it isn't uncommon at all. Very common, actually.