Visual Attention Therapy is an app with two modes: Test and Practice.
In Test mode, you can touch any target in any order. When you finish, you will get a report on which targets you missed and where the most missed targets were (top/bottom, left/right).
However, in Practice mode, you are learning to do a systematic search from left-to-right, top-to-bottom. If you touch a target out of order, it will not be counted. You must find the NEXT target moving line by line.
Here's a video demonstration of the difference: https://youtu.be/LCLiYu4TeEM
It's most likely that the app is working correctly. If you have watched the video and still believe there to be a problem, please reach out.