Next thing is the odd chain line of the slack strand.
From this perspective one can see that the chain line of the tight strand (red) is straight, but not that of the slack strand (green) - here's the chain bent inwards by the chain tensioner.
The second pic shows the nuts of the roller axles, these should be much more upwards (close to the red chain line) - if the line would be straight.

I've never noticed that at other bikes and wonder if that is normal on a Curl?