The sequencer is resetting the SunSky actor for no apparent reason

Hi, can you please help me understand why the thing in my screen capture happens?

I use the SunSky actor on the first level, I have set it up, but the sequencer resets it, somehow. I have two sequences and they are also loading and unloading the levels with the visibility track. As you see in the video, to reset the SunSky on my liking I turn it off and on again in the outliner. Then I move the playhead over the timeline, and as soon as I reach the second sequence, the SunSky resets and the image becomes much darker. Can anyone help please, it is really making me crazy?