Concrete road should be a service road as far as I can tell from the screenshot. There are no missig road connection icons at the vehicle checkpoint, nor at the fuel tanks. Also there is no end of the road in the middle which would (imho) be a hint for an expansion of the service road with public roads accidentally.
My first try would be to remove all these parallel roads, but to be honest, it shouldn’t be a problem?
Other questions: Are there bought fuel trucks? Is there a contract with an fuel supplier? But this would be generic problems, and not only remote stand related.
edit2: Just to make sure … you did build the road pieces which are on the taxiing path itself? They are not shown anyway, but they are a must have.