[BUG] Analytics of Feedback: "Average NPS" calculation is incorrect despite correct source data

[ketlyiouriev]

Bug description:
The Average NPS value displayed in feedback analytics is incorrect, even though the underlying source data and related calculations appear to be correct.
The NPS value should be calculated as: Satisfied (%) − Dissatisfied (%). Both the Satisfied (%) and Dissatisfied (%) values are displayed correctly, but the resulting Average NPS does not match the expected calculation.

Expected behavior:
The Average NPS value should equal the difference between Satisfied (%) and Dissatisfied (%).

Additional information:
Since the source data and all other related calculations appear to be correct, the issue seems to be isolated to the Average NPS calculation. The underlying calculation logic should be investigated.
This issue was initially reported by customer. I was unable to reproduce it using the same data, but I observed the same incorrect calculation when selecting February as the reporting period.

Screenshots:

image that the client sent:

reproducible in TEST ENVIRONMENT when February is the selected period:

[ketlyiouriev]

TEST ENV - OK!