Were you using music? I have seen multiple people Stream and Post Multiple Youtube videos just fine, a lot of people do turn in game Music off as this may cause it to flag. Double check what your posting does not have any additional Copy write content.
Reakktor is the copyright holder of the visuals, and they allow you to use it in your youtube clips.
The audio material is licensed from 3rd parties, meaning that someone else holds the copyrights. If you want to use that audio, you also need to get a license from the copyright holder. And since that isn't Reakktor, they have no control over the copyright claims, which is something between the copyright holders, YouTube and you.