It doesn't really matter if Dreamcatcher is popular in Europe, it's a Chinese show picking out a Chinese girl group. It all depends on China's citizen's choice and opinions. Although it is kind of sad that Dreamcatcher isn't popular in China though, I think it might be because their music style clashes too much with WJSN (Cosmic Girls) which is quite popular in China.
XF C I think WJSN in China is popular maybe because of the members Meiqi and Xuanyi were the first and second place in the China Produce 101 and debut in Rocket Girls. Also,Chengxiao was the mentor in idol producers (the show that kun debut)? So the popularity raise up?
The International ranking actually will not be counted in the China ranking, the ranking is only ranked for how much international resources can be given, which is very useful when comes to international popularity