Very very far-fetched theory. I doubt this will be the case but I am stating it here anyway.
A'yun may be contradicting her skills, i.e. letting Ziyu win against her versus beating Jin Fan, because she wants them to be suspicious of her.
But the issue is why?
1. Is she going to pull a whole "double agent" thing where she pretends to have turned a new leaf/betraying WuFeng but in the end doesn't?
2. Is she doing this so that once her identity is discovered they will lower their guards somehow and pity her? But how?
3. Is she trying to weed out the anonymous person/the other person for Wufeng?
4. If she is caught, she might get to figure out what happens to the other Wufeng spies that are caught/where are they taken/kept?
I honestly can't think of any other angle where this would be beneficial for her.
I think that the mistakes are intentional because even with ep 1 where I thought she was messing up initially, I later realized she wasn't. She was going to save the girls by aiming for GYZ, not GZY, and then as someone put it "find freedom in death". So I feel like I probably should not assume just yet that she slipped up.
But at the same time, mistakes happen so I'm torn.