Not getting new chapter notification

So recently i have noticed that i aint getting a notification when new chapters are added to a certain series even when i have already bookmarked or is following them. The notification is enabled yet i didnt get the notification. It only happened for 2 series Cherry Picking and Incomplete Combustion i didnt get a notification when new chapters was added to Cherry Picking both were free chapters. The new chapter of Incomplete Combustion was a paid chapter.

But when two new chapter were added to The Light I Give You i got notification and both where free chapters.

Im not sure if the notification didn't come through coz it was paid chapter or coz i had custom notifications turned on. I have not noticed if this happened with any other series coz i accidentally saw the new chapters of the mentioned series and i might have to go over my emtire library to be sure. Just wanted to know of anyome else had this glitch.

Gonna add some screenshot just incase