Jukin obtains many videos directly from creators, but our library also contains videos that are owned by media companies who have partnered with Jukin and allowed us to license their videos on their behalf. In some cases, when you license and use one of those Partner videos, your channel may receive an "Ownership claim" stating that the video is owned by that Partner.
This is NOT a notice of infringement, and your channel is not harmed or negatively affected in any way. It is just the platform's way of notifying you that the content is owned by the Partner, and not by Jukin, even though Jukin has the Partner's permission to license it to you.