Metrics is missing after remove member from group

Summary

Metrics is missing after remove member from group.

Steps to reproduce

1. There already have some metrics in performance analytics.
2. Remove one member who had contribution on this group.
3. Refresh performance analytics page.

What is the current bug behavior?

1. The contribution which is made by the removed member is missing.

What is the expected correct behavior?

1. All metrics should be retained, whether the members are removed.

Relevant logs and/or screenshots

Before After

/cc @lpeng1991