Bookmarks Not syncing in iBooks

Since the update to 13.4.1 my 2 iPads won’t sync bookmarks. I read on 1 at night, when I finish I bookmark the page. When I want continue reading the book on my other iPad the bookmark isn’t there. Everything is on and I’ve toggled offf and on as well. 1 device is iPad Pro 12.9, the other is iPad Pro 10.5. Both 13.4.1. Thanks!