It's duplicate manga which admins deleted one out later. Unfortunately the one they deleted is the one you marked. You have to mark the left one in again.
There's that too but that's not the case for today problems. Mangago notif me with the manga updates, but it's not in my reading list (gone) even though I already add it in but it's gone and mangago still notif me. It's a good thing I notice or else I won't get the next update, right?
And i know for sure the manga that I've added isn't duplicate because i saw the same comments on the manga page.
Which manga?
It's duplicate case.
Dear mangago,
I noticed that there are mangas that I have already add to my "I'm reading" and "Already read" disappear from my reading list and that makes me don't know that the manga have already been updated. So far, there are 4 manga that disappear from my reading list and today, you just add it to become 5. I wish you can fix this problem or tell me why it happens.
From your loyal user,
G€MIΠI