Even if I know how to fix it
1. Pongo wouldn't like anyone messing with his creation
2. If you fixed it and Pongo release new changes, then you have propagate fix
Best to ask originator for answer or fixes
What map/country are you using?
I have no ideal. My street numbers are correct. Skins (any) take values from map engine in variables named right and left; so if you're seeing it reversed, something wrong with your map or proggy, nothing to do with skin.