Simple,
You have the left silencer on the right side and the right silencer on the left!
He presto, two silencers that are upside down.
However, if I recall, the last time I saw this arrangement on a boxer the owner had also cut about the silencer mount points.
If you had panniers/cases it would prevent you from using them.
Also, if you like it the way it is, then leave it the way it is. Its your bike!
Mine does not even have standard silencers on it....or even anything that can be honestly described as a silencer m'lud!
Cheers
Steve