Like many others I have the same problem, there is a bug with the Ark Addition: The Collection mod. I think the problem could be easily solved by simply changing the name of your Brachiosaurus to a new name. I guess both dinos have the same name in the game files and that overwrites both dinos. Would this change be possible? Many would like to use both mods for their server, but unfortunately this is not possible. Maybe the mod could also be given to another modder to keep it up to date and functional. There are many people who include such dinosaurs in their mod collection. Thanks very much