I have receive every notification so far, but I don't have much manga i follow. Also, most of the time I receive a notification the day after the release.
It kind of happens to me as well. Some manga i have read don't show up as i marked them (and i remember marking them as read and rating) doesn't happen too often though.
Same with me. The most notification that on time is my shounen notification update. But mostly my yaoi ongoing I figured it out myself by checking new chapter every night. Or read comments. So I know they are update.
Thanks for the info! Some I'm not the only one with this problem. Yeah I usually also see the updates "by accident". Wish it would really work for all of them (I'm reading a lot :D ) Thanks for the answers!
Does anyone know why the notifications don't always work? I only receive about 5%. And I have a lot more marked as "reading". Thanks!