The Float Any River boss doesn't drop victory markers, which I don't think was intentional (all other raid-level bosses drop victory markers). Can't see my change history at the moment, so for the moment I'm not sure whether that's something new or not, but most likely I accidentally pasted the souvenirs over their victory markers instead of inserting a new line. Whether it's an old or new issue, it's an easy change, so I'll get it fixed for our next update.