[bmh100]

Rankings can seem to be unstable if the absolute differences between the scores are very small relative to the likely ways those scores could change.

Example:

Rank,Score

1,0.81

2,0.541

3,0.540

..

40,0.538

Increasing the value of row 40 by just 1% will cause it to go from rank 40 to rank 2.

Edit: Improved formatting.