Some inserted clips dark

I imported several clips from an action cam. mp4/29.97 fps. Transitions are fading.
After rendering, some (of the clips are ok, some are dark).
Any hints?
Thank you!

What happens when you remove all the fades and then render?

A screenshot of your timeline might be useful, and perhaps upload your mlt file.

Thank you for your hint. I will try out what happens without fading. This will take some days. I will report the result here.

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