Whether digest mail data displayed is from user last seen or Week by Week data?

Looks like the count of users in the digest emails have some discrepancies. Is it different from the new users signed up? Or Whether it is about new users active in the community?

Following is the count of new users as per the weekly digest mail and then the report of new user’s sign-ups

count of new users as per the weekly digest mail
Feb 5th Digest - 5 new users (Looks ok)
Feb 12th Digest - 9 new users (Looks ok)
Feb 19th Digest - 10 new users (Looks ok)
Feb 26th Digest - 3 new users (Looks different)

Sign-ups report on days

January 30, 2023 1
February 1, 2023 1
February 2, 2023 1
February 3, 2023 2

February 6, 2023 2
February 7, 2023 4
February 8, 2023 1
February 9, 2023 1
February 11, 2023 1

February 12, 2023 1
February 13, 2023 3
February 15, 2023 1
February 16, 2023 2
February 17, 2023 2
February 18, 2023 1

February 21, 2023 1
February 23, 2023 5