Green and Red make up 50% in terms of proportion, Blue and Yellow make up 50%.
The total actual votes for Green + Red is maybe 1/8 or 1/10 of Blue + Yellow, so they scale it up to make it even such that every Korean vote is worth x8 - x10 of 1 International vote.
The way Koreans are voting is that they only vote Koreans, most of them, whereas international fans are split among K/C/J.
Because of this, Blue + Green which is the Korean trainees votes are so much higher, while the C/J votes are so much lower, explaining why even the last ranked Korean trainee in the previous episode can even triumph over the 1st play foreign trainee
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Unless the votes change drastically, we are going to get a 8K or 9K group