Only one target position is recognizing

Hello together,

I have a problem. I created an AR-App with an Vuforia Model Target.

The App is recognizing my target very good. But only in one Position. But with I created six different views of the target. This six target positions are around my real object (every 60 degrees).
Why my app only can recognize the first target osition?

Another problem is, that when the first target position is recognized, I can not walk around my object for 360 degrees, although I have model targets all 60 Degrees. What does I have to Change, that I can go around my object, without losing my target?

It would be nice, if somebody can help me.
Thank you.