Cars don't follow pit line from pits??

[lccst]

Hi there, I've got an issue where when in track day on my custom made track, the ai cars don't follow the "pitlane.ai" line and instead are just driving into the side wall. my assumption is is that they are just trying to go directly into the fast lane line but why wont they follow the correct line?

the surface for the pits has also been created and checked as "is pits" too

if anyone has any advice or solutions please let me know as its sending me crazy