The estimated position value is wrong at iPhon 8.

Vuforia SDK Version: 6.5.22 -

Description with steps to reproduce: Hi, Vuforia Developpers. We used our app on iPone 8. This app building does not have terrible problems. But, I thank some strange. The estimated distance was a little bit large, isn't it? So, I made the simple app that is just showing the position value of each image targets. The below photo shows the difference between iPhone 6s and 8. The z value on iPhone 6s showed the very close to the measured value. On the other hand, same app on iPhone 8 showed about 20% bigger value !

 I think that this difference is caused from the difference of the Field of View. Please tell me how to fix this. Thank you. nota -

Development OS (Mac OS X, Windows, Linux): Mac OS High Sierra 10.13.1 -

Mobile OS and Version: iOS 11 11.0.3 -

Mobile Device Manufacturer and Model name: Apple iPhone 8 -

Do the Vuforia Sample Applications show the same behavior?: I made this application from the sample scene. I add just the showing text.