Yet Another Strange Keyword Curiosity

The series Detention (2020- ) had only two keywords, "ghosts" and "students," both of which are incorrect because they are plural.

Two attempts to correct them hare not being accepted.  I first submitted deletions of the "s" at the end of each word, which was not accepted.  Then, I submitted a deletion of both incorrect words and the addition of the correct keywords, "ghost" and "student"

Instead, the title now has four keywords: "ghost," "ghosts," "student" and "students."  The system or the keyword list manager is not accepting the correction.  It should only have the keywords "ghost" and "student."

This is such a simple thing.  I would love to know what's going on?