Trading style has changed. Part of history is not included in statistics.
Read the thread Signals - Reliability about explanation the "way to calculate" (and this way exists for many years so everybody knows).

Signals - Reliability - How do you understand the Reliability Index for Signal providers?
- 2018.12.07
- www.mql5.com
How do i understand the reliability index for signal providers. Discussion about the signals is prohibited on the forum so i can only remind the following - from this thead: metatrader 5 trading signals redefined - are there any reliable signals providers. You can go to the signals page and sort the signals based on reliability for example

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why last month i got profit, but this month returned to 0%, is there any other way to calculate
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