Just received round 270 day 1 performance today, the model CORR and MMC dropped to very low level. I am confused with this resut, considing similar model used to generate predictions in previous rounds, and those old prediction still maintain 0.05+ CORR on 1july.
Why this could happen that same model can create such big difference on the same date in different rounds ?
I check the leader board and saw the similar pattern. Pls suggest your thoughts.