When moving pages in the main namespace, {{NUMBEROFARTICLES}} is decreasing.
For example, if you move a page to another in the same main namespace, the number of articles is decreasing from 448,008 to 448,007.
Special:RecentChanges also shows the invalid number of the articles.

The actual number is 448494 or more when counting non-redirected main articles from the database as of 01:17 Mar, 10.,2019 (KST).
https://ko.wikipedia.org/wiki/위키백과:데이터베이스_보고서/이름공간에_따른_문서_수

Above issue has been originally raised from https://ko.wikipedia.org/w/index.php?title=위키백과:사랑방_(기술)/2019년_3월
Thank you.