Ads security issue affecting all Android system
it keeps reappearing because you are not removing the problem causing potentially unwanted program. You probably have something from that category and these intruders are not that easy to remove. You uninstall only the feature that annoys you but not the problem itself. Especially since you can see there is not one program appearing.
You should rely on anti-malware tools and remove possible threats, intruders, cyber infections. There is a few available online for free. You can find them on the App Store. Those programs can detect, remove and even block threats later on. 
These additional programs come from insecure ads, websites, installations. So you can't see when they were downloaded exactly and the ones on your browser are not the main program that causes problems.