After the site crashed issue whatever it was all ur currently reading got moved to completed. So u have to manually go back and change them to reading now again. Thank god i read comments otherwise i would have not known. Also, keep a list on ur computer of what ur reading or finished. Because trusting the sites to save info forever is not logical.
Yes, all of my "Want to read" got deleted and my Now reading and Already read lists got merged, so I started adding some series again that got deleted or changed.
As I said in my comment, I read this manhwa again AFTER the crashed issue. So, I added it again to my list, but got deleted again.
I do a back up every month, but it's not like I check it every time I'm reading. I kept trusting the notifications, but I've noticed that even if I add them again, some of them get deleted. That's the issue.

So... I'm sure I was reading this and after the manga go crash out I read it again, but I forgot again because I didn't receive any notifications.
A lot of my series have been deleted over and over again ;;
Is it just me?