When a hyphen (-) is used in a category name, it is replaced with a space once the category is saved. For example, if the category name "abc-xyz" is provided, the category name is saved as "abc xyz", with the hyphen removed. To avoid this issue, do not use hyphens in category names.

When a colon (:) is used in a category name, the text string before the colon is ignored once the category is saved. For example, if the category name "abc : xyz" is provided, the category name is saved as "xyz", with the "abc" string removed. To avoid this issue, do not use colons in category names.

There is no check to prevent two categories having the same name. However, this causes a problem when selecting these categories from the navigation pane. To avoid this issue, make sure that each category name is unique.