Strategy passes correlation check in backtester but fails correlation filter after submission

[antinomy]

Hi @support,
When I run my strategy with qnt.backtester.backtest setting check_correlation=True it passes the correlation test.

When I submitted it to the contest it got rejected and in the candidates tab it has a message about high correlation:

Looking at the short description in the strategy history it passes all tests on every trading day except for the last one (2025-06-24):

I don't quite understand why it passes the correlation check in the backtester but fails it after submission on the last day.
Which correlation test is wrong, the one from the backtester or the one running after submission?
If it helps, the strategy in question is a q 19 submission by another user and when I look at it there are only 87 data points.
My strategy is 18633730 and the one it has or has not a high correlation with is 11938152.