App prompts not closing automatically. On Moto G Osprey with Resurrection Remix ROM

When an app asks via a pop-up prompt: "Do you want to allow such and such change to be done" and I select yes(or no), this Yes/No prompt goes into background, but does not close, so then I have to close it manually through the "App Switcher".

Any ides why they don't close on their own?

Thank you in advance.