Despite the fact that disrespecting stunt doubles is a wrong thought, I have to agree that the producers of this show should have paid more attention to this silly mistake.
When you look at the mid-air flip right before this scene, Venus' face was blurred out. That shows they were aware of this stunt problem and how careful they were about this. But in the next scene, blam! What happened? Did the editor fall asleep or think that no Smoon fan had a sharp eye? They were trying to believe that viewers (kids...) can be fooled, so no more necessary editing. But they were wrong.
It was a huge mistake. Hope it won't recur in the coming episodes.