How to delete column from table selector without error

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I am using a table column selector. I want to delete, add and edit the columns of the table at will.
However, I get an error. Because of a very big problem, I can't do the editing as I want.
It is possible to add an available column, but it is not possible to delete the added column.
Even if I delete a column from the table column selector, the column I deleted remains in Available Columns. And, not only are they not deleted, and the names of existing columns are initialized or changed to unknown names.
Doesn't this problem occur in the English version? Is there a problem with the Korean version? I am not sure how to solve this problem.
I want unused columns to be deleted, I don't want them to be deleted and recreated, and I want to work around weird renaming of existing columns.
I am really confused about this issue. Please help. Attach the idw where the error occurred.