Android : Metaio - 3d model based tracking

i am following below link for model based tracking. https://dev.metaio.com/creator/tutorials/tutorial-14-3d-tracking-based-on-cad-model/

I am trying to track a .md2 animated model based on another 3d model, which is featured in Metaio but when i set everything and start quick preview, everything will be perfect until model track, once it is tracked and a .md2 model appears on screen, background starts affecting it i mean even after i removed the base model still i can see .md2 model. Can anyone please suggest me what i am missing.

1. Setting up basic thing in Metaio.

http://s8.postimg.org/h1hx4cl4l/Setup_in_Metaio.png

2.. .md2 model appears once base model is tracked.

http://s27.postimg.org/d14qsuv6b/Start_Tracking.png

3.. Model is not tracking continuesly :(

http://s22.postimg.org/snqtg62sh/Object_not_tracking2.png
http://s21.postimg.org/isad196af/Object_not_tracking3.png