some mangas disappear?

mangas, manwha, webtoons etc whatever you want to call it, has anyone else noticed some of them just up and disappear? I was looking at my topics and comments when I noticed that they weren't in order. I looked though them all to notice that some were missing! so I looked for the items I spoke about to find those were not here. Most noteable killing stalking. Now I can see why that would be taken down, but there were many. some from so long ago I can't even remember the names. Has anyone else noticed this? Or am I going insane?