Suggested

shapes of circuit

Is it because of copyright that the shapes of the tracks are wrong?

Yes.  FiA and F1 have copywrited and trademarked the actual track layouts and IgP towers did not think that the amounts required to licence those layouts was a good price to pay when initially rendering the 3D tracks.  So they had to alter the layouts as to not infringe copywrite laws.

so thats why the Monza chicane goes down

Still they are so similar they dont make any difference

I thought that some of the tracks were rendered to 3D from an older game which is why Spa had the old bus stop, and the rendering on some altered the track length and therefore the lap count. It could be copyright but most of these tracks are not confined to F1, the rules over pretty much all categories are governed by the FIA but events also have their own local rules so that doesn't make any sense. 

I do miss having 2 different GB layouts. RIP Bridge Corner

Why cant we have GB09 with a slight change and only 2d? From what i saw it seemed fun

I disappointed when  I saw my car braking at the pouhon turn in spa

Copyright doesn't sit with FIA or Formula One. It sits with the Track owners. For example, Silverstone is owned by the British Racing Drivers' Club. iGP would require a license from them in order to showcase the track to iGP.

Definitely a copyright issue.  I remember the discussions around 3d and the price to copyright was a msjor issue.  Maybe due to the F1 game makers more than the FIA.  But copyright was the issue.