Well, actually it's a minor bug, but still it IS one, because it doesn't make sense at all. And it has been bothering me for quite a while now.
These are the bonus points for beating a top 5 player:
No.5 - 50
No.4 - 55
No.3 - 66
No.2 - 75
No.1 - 100
As you can see, the points difference increases from 5 (between no.5 and no.4) to 25 (between No.2 and No.1). This makes sense.
So you would expect the same to happen between the other numbers.
From No.4 to No.3, it's 11 points, but from No.3 to No.2 it's 9 points all of the sudden.
This is just wrong. No.3 should be worth 63 points, then you would have differences of 5, 8, 12 and 25. That would make sense.
Instead we have 5, 11, 9 and 25. God knows why.
And yes, there are far worse problems in the world.