It looks like your bookshelf got corrupted. Did this happen before the last update? I’ll try to upload a hotfix that will automatically clean up the corrupted data as soon as possible, thanks to report it!!!
Yes the same thing happened on pass update before the big changes. I tried clearing app to get the bookmark fix the blank on bookmark .it works but all my tag bookmark got wipe sadly I tried tagging all my recent bookmarks but the blank returned so I got disappointed that I'm gonna started all over again. Please fix it thank u