Hi Jordi,
I understand that it must be frustrating to see the numbers go down, especially in a city as huge as Barcelona. My city is much smaller and I assume, that I finished it. Just waiting for an update to correct the data in CS to make 100%. The last four streets (that are not actually streets and which I corrrected in OSM) make me fourious sometimes. 
I totally missed that change although I read the forum pretty regurlarly. When I check OSM-data, I always compare with the query in the wiki. This still includes [‘highway’ !~ ‘track’]. So I was super confused about all the tracks that are listed in my city. This posts clears that up. Thanks!
I have some similar odd nodes in CS, that noone could explain to me yet. Why are these nodes in CS?
These are nodes that don’t have the highway key. Maybe they point to the same cause?