Preference setting for media unit turn into quizes

Hi, 

So i'm trying to set my project preference to work with my e-learning materials, i have 4 units with the last one being a test, however, even if i tried to change their preference, my lms still considered all 4 units as a test unit. 

The icon of the media unit shoud look like a checkmark, and the icon of the test unit shoud display the T sign, but my project were all show the T icon, so it interfere with my scoring system. In which all learner has passed and scored a hundred percent but still in the 'learning' process. Not 'passed'

This is my first time using Captivated! I hope i explained my worries well and if you want more information about my incidents please do tell me.

Thank you so much.