Of course, there will always be bookmarks that can not be marked correctly. This applies to every extension of this type without exception. Because not every website allows such a check. Firstly, there is a special whitelist for such bookmarks, which you can add to. This is even stated in the description of the add-on. Secondly, you could also report the affected domain to me and I would put it on the internal skiplist to exclude the domain for all users. Due to a user error (the Bookmarks Organizer is a tool and tools must be used correctly! This of course includes a manual check!) to give the developer of a free extension, which does everything possible, the worst possible rating is absolutely cheeky.