Defies its own logic

I would rate this higher, and maybe even buy the ad-free version, if I knew for certain the pay version would work flawlessly. Ive been stuck on Level 14 for weeks, getting the "try again" pop-up while the balls are still actively falling through the filter. So frustrating, especially since I cant find an explanation or instructions anywhere. Just seems to not follow the same logic as all the previous levels. Ive given up!

The_Melster about Bubbles Shooter - Bubble Burst