It's hard to know without context, but I can imagine one way this could happen. If you made two separate mappings for right signals and left signals. Then when they swapped side then they would move with their mapping. E.g. in a car that was built as right hand drive, if the right signal was mapped to more 'outward' triangles and the left signal was mapped to more 'inward' triangles, this fact could be the same after swapping sides, which is not what you want. Maybe it can be solved by using a shared mapping for the left and right signals, or by using a dashboard subobject.