From a previous post by a Terri:
This will actually happen with a lot of Stock Libraries. It is the downside of using automated detection. It isn’t perfect.
The good news is that we have the ear of Storyblocks and they are providing us with an easy process for working with YouTube and getting warnings and messages about monitization removed quickly.
If this happens to you, simply send the following for the video that has been flagged to email@example.com
and we will have Stroyblocks handle it.
1. Link to YouTube Video
2. Link to or name of Storyblocks track used
3. Name of claimant
One reason this happens (and this is probably not the only reason) is that musicians sometimes use sample libraries to create music. If a musician claims a copyright on some music in which they used a sample library to create then everyone else who used the sample will suffer. The musicians should not be copyrighting music that is made with samples, and in a perfect world all music would be created without Libraries but that is simply not the case and it is why we can now get music for relatively inexpensive.
I would caution over-reacting to these messages. They will happen, and they can also be cleared easily.