Maintaining the size ratio - Vuforia

I am making a game which involves some augmented reality using Vuforia. My game is a basic 2-D platformer currently having 2 scenes. Scene 1 just has a movable character,jumping from one platform to another. It works perfectly.

Scene 2 is just the copy of scene 1 except that it involves augmented reality - it tracks the marker and then spawns my player and detaches it from the marker gameobject,making it independent gameobject.

Now the problem that i am facing are:

• In scene 2 player is not jumping or running the same distance it does in scene 1, making my designed level useless- i can not reach other platforms.( i think i need to shift from ar camera's coordinate system back to unity's coordinate system- i don't know how to do this.)

• I am having a hard time in getting the spawned player to be of the same scale it is in the other scene(I know it has got to do with the distance at which the target is detected but don't know how to handle this and change its scale to normal).

Any help is appreciated.