Ah, seems like it only affects the JPEG-focused effects, which makes sense. Still, maybe these should be disabled or more obviously labeled when using PNG templates--thanks again for the report.
Thank you for sharing this screenshot. If you or anyone else reading this comment has screenshots of other ads that pop-up, please post links to them below this comment.
I see, that's strange; I am sorry for the unexpected behavior. One simple thing to try is just restarting your device--I am curios if that resolves the issue.