So I haven’t seen the episode yet, but let’s all remember something.
Eros is about a womanizer conquering the heart of a lady who didn’t like him at first.
Yuri on Ice is about Yuuri’s love and career.
As we know, Yuuri tends to nail the Eros routine and flop the YOI one. Thing is, as of now, Yuuri doesn’t have to be a katsudon to seduce Viktor anymore. He doesn’t have to skate like he has to get a man, since well, Viktor and Yuuri are literally engaged.
Tl;dr- I feel like this sudden switch of score is supposed to represent the changes in Yuuri’s life (and relationships). Both routines take completely opposite meanings in regards to love after all. So yeah, don’t panic (and don’t start to bash the series too omfg it has given us so much so far), love will still win in the end!