Looks like it's a YouTube thing. I just went through Audio Jungle's terms and you can use it on YouTube. But YouTube has very aggressive detectors and they shoot first, ask questions later. Audio Jungle even addresses this on their FAQs:
So I should be able to clear this up. Will let you know.Can I use music from AudioJungle on YouTube? Why have I received a "matched third party content" copyright notice via YouTube about AudioJungle music used on my YouTube video?
Yes, you can absolutely use licensed AudioJungle music in your YouTube video.
YouTube takes copyright infringement seriously, and its Content ID audio detection system will occasionally display a copyright notice on videos using licensed AudioJungle music. This typically isn't a bad thing, it simply means YouTube has found some material in your video that's owned by someone else. To clear this notice, you simply need to let YouTube know that you have licensed the music and have the rights to use it.
For more information and help on clearing a copyright notice please see our Help Center article Buyers Guide to YouTube Content ID & Copyright Notices.