I can't see any signage suggesting that  these streets should be tagged as highway=living_street, which in the UK would be a TSRGD diagram 881 Home Zone sign (like this one https://commons.wikimedia.org/wiki/File:Home_zone_Higham_on_the_Hill_Nuneaton_Dec_2019.jpg ).

I think this is likely to be a problem with how StreetComplete interpreted your response to the AddMaxSpeed quest, rather than something you did. I'll restore the streets to highway=residential.