WordPress site ending with /x will auto redirect to a post with x started?


I find a very strange thing. In a wordpress site, if I add /x to the end of the URL, then it will be auto redirected to a post with that character started, instead of reporting 404 error.

For example, https://www.datanumen.com/s will redirect to https://www.datanumen.com/wpclients/samsung/
https://www.datanumen.com/a will redirect to https://www.datanumen.com/access-repair/errors/access-2003-complete-error-list/

If there is no such a post started with that character, then it will report 404 error.

What is the problem?

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