Race track mesh scale up borders

Hi all,

Im creating a race track and convert the curves to mesh option. Then select the outher borders on both sides of the track and scale this up. A big part is what I expect but some parts are scaling down. I include a image to see what I mean.

I dont understand why this happens.

Is there a particular reason why you use scale instead of move ?? And if with what pivot point… ???

It was my mistake… I had some points lower then others, now everything is fine.