I don't see my full video clip

Do you only see a fragment of your video clip instead of the whole clip? 
Quik does its little magic with your video clips, when you add a video clip it will only take some fragments of it, they are called Smart Cuts.

QUIK IOS

In the EDIT VIEW, tap on the "scissors" icon on your video clip, check the option "play this clip without cuts"  
Also, to avoid a zoom and pan effect you can change the FIT option.

QUIK ANDROID

in the EDIT VIEW, tap on the "scissors" icon on your video clip, there you can uncheck the option "smart cuts"