I must admit I did not notice that littl 's' change.
I would not even know how to start thinking about what made the change?
The Raspberry, the one you are forwarding port 80 to, probably did that redirect.
It's not an issue, usually.
As long as you forward 80 and 443 to the same machine, at least.
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Not likely from the same system; As the redirect came while using --standalone:
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Port 80 was forwarded to another system, not the one running --standalone 
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Ok, that's would be to the RPi - I get it now!
So if I deleted the port forwarding rule from my router and shut the rpi down - then certbot could complete the challenge?
and what would happen when the rpi will return together with its rule?
no. you just need to change the port forwarding, no need to turn the pi off.
or you can just make the pi get the certificate and then reverse proxy the second device. it's just a matter of adding a virtualhost to apache (on the pi) (apache, or whatever http server you have on the pi)
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