Gopro camera created mystery video?!

I have a gopro hero 3+ black edition, and one day I was biking. I started a video at 1080p, 60 fps for about 10-15 minutes. I stopped that one, started another one that ran for about 20-25 minutes until the battery died. It stopped and saved the video before turning off. When I put the micro sdhc card into my computer, there were three videos. The third one was footage from about 5-10 minutes after the second video. It has a different name that doesn t go with the pattern of the other two. (For example, the other two say: GOPR0019.MP4 and GOPR0020.MP4. The third on is GP010019.MP4) the third video is about 8 minutes long. When I put the micro sdhc card back in the gopro, it only recognized there being two videos. Anybody know how that third video got there?

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