My mangas are deleted from my account???

Hey guys I realized that some of the mangas that I had in my reading list are gone? Like the mangas that I have been reading since the first chapter. I know I didn't delete them from my account I put everything I read to my account even if it is trash so I wouldn't have to reread accidently.
It happened a couple of times and now I realized the mangas I have read/reading is less than what it was. Like wth is going on??? Where did they go! Is this just me?

Only reason I realized bcz I wanted to reread netkama punch lol.