That's how it's supposed to be, in addition: if you move from a road to a trail, you move to that plot as if it's on a trail, the weakest route between two plot always trumps the stronger one.
This is how it was in vanilla BtS, and this is how it has always been in C2C too until some change in the latest month.
Spoiler Could it be this change? :
I reverted that change in the svn try it please and report if it works for you as well.