Once your beats begin matching videos on YouTube, you will begin to see disputes. This is nothing to worry about, and is perfectly normal. Once a claim is disputed by the video owner, this will show in your Dashboard as Disputed.
In this situation you have two options: Remove/release the claim, or do nothing.
Removing the claim will result in you no longer claiming for this video. (You can still monetise other videos using the same beat). We have more info on this here.
If you wish to continue monetising the disputed video, simply do nothing and you will continue to monetise it.
Claims can be managed by going to
Dashboard > Monetization and clicking
Claims in the top right.