Mentosan, it is a good question. Thank you!
When the Generator pushes a strategy to the Collection, it calculates the Correlation coefficient of the new strategy against all available strategies.
The Correlation coefficient is between -1 and 1. Where -1 means the opposite direction of the lines, and 1 means equal lines.
Two strategies always have a correlation coefficient calculated. The Correlation analysis in EA Studio compares the correlation coefficient with a threshold.
The default value of the threshold is 0.98, as in your example.
It means that EA Studio will mark two strategies as correlated if the correlation coefficient of the two strategies is higher or equal to 0.98.
The program marks the strategy sorted below for removal. The strategies are usually sorted by profit, as shown in your example. EA Studio marks the one with the lower profit for removal.
You correctly noted that the two balance lines are different. However, their Correlation coefficient is higher or equal to 0.98.
If you want to accept such-looking strategies, you can increase the threshold. You may try with 0.99.
When I created the Correlation Analysis function of EA Studio, I found that 0.98 is a good compromise and works in most cases.
EA Studio also provides the Manual mode, as in your example. An experienced trader may decide what to do in such a case.