it's a glitch. there are 4 links here https://www.mangago.me/home/mangatopic/21102909/ about it and some suggestions you can do while you wait
they are not gone, will be back soon, read these :)
https://www.mangago.me/home/mangatopic/21080691/
https://www.mangago.me/home/mangatopic/21092806/
Mine too its so weird
read the 4 links here https://www.mangago.me/home/mangatopic/21102909/ it's a glitch it's being worked on. things will come back in time.
MY BOOKMARKS ARE GONE MY WHOLE LIFE MY LEGACY OVER MORE THAN 6 YEARS GONE I HAD LIKE MORE THAN 6 THOUSAND BOOKMARKS I SPENT EVERYDAY ON THIS SITE READING SO MUCH SAVING SO MUCH IT WAS SO MUCH WORK PLS IF I DONT GET IT BACK WHATS THE POINT ATP SLIME ME OUT