Does uninstalling a WordPress theme delete its database values?

It depends on the theme itself. A theme may store some data in the database.

For example, a theme may have an option called “Social Accounts” section in settings page and a field “Facebook Page URL” in it. If you fill the field and save settings, it will store this value to database.

But, as a common practice, these type of data should be removed when you uninstall/delete this theme (it depends on the author). If it does not remove that data and you re-install the theme, then the values will be used again.

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