Y axis of "Insights" page shows 'm' unit of measure

Summary

From point 2 in this issue, the Insights page sometimes shows a "m" unit of measure similar to this issue #295674 (closed)

Steps to reproduce

1. In a test project, ensure you have at least 6 open MRs and 2 merged MRs. Label them as follows:
   • 1 Open MR with Label A
   • 3 Open MRs with Label B
   • 1 Merged MR with Label B
2. Configure your .gitlab/insights.yml to look like this:

  title: "Charts for Merge Requests"
  charts:
    - title: "Monthly Created"
      description: "Opened per month"
      type: stacked-bar
      query:
        issuable_type: merge_request
        issuable_state: all
        collection_labels:
          - Support
          - Development
        group_by: month
        period_limit: 24
    - title: "Monthly Merged"
      description: "Merged per month"
      type: stacked-bar
      query:
        issuable_type: merge_request
        issuable_state: merged
        collection_labels:
          - Support
          - Development
        group_by: month
        period_limit: 24

What is the current bug behavior?

Note the Avg: 167m in the screenshot below

What is the expected correct behavior?

I believe the average above should be 1

Output of checks

This happens on gitlab.com

Possible fixes

There is a similar issue here #295674 (closed) that later began returning "NaN" !88507 (merged)