My numerous warnings that stability factor used in Quantopian open scoring system promote algos witch are doing nothing or consistently loosing still did not get any response from Quantopian staff.
Look here,and here, and here, and here, and here.
If you look at formula you may find out that it is well known coefficient of determination or R-squared of the equity trajectory through time
and does not take into consideration if the equity trending up or down or flat.
To make stability factor reliable multiply coefficient of determination by sign of anyone of
1 Omega Ratio -1
3 Sortino Ratio
4 Sharpe Ratio
Then only stability factor will do it's job and may be used as separate ranking factor.