The "Pick by Comparison" condition is selecting the wrong instances of objects.
How to recreate:
Open the attached "wrong instance.cap" and run it. Hold the right arrow key and run each sprite into the wall to stop it from moving.
The Pick by Comparison condition should change the color filter for each sprite when it's Plaform.VectorX is greater/less than 50. The wrong instances are changing color.
Wrong instance picking example