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the smarty template layer keeps cached copies of your theme files, so if you make a change and do not see any updates on your site you can clear all the files from the templates_c folder to force smarty to regenerate all templates.
To prevent this issue from occuring at all, turn on "Update module template .html files from themes/your theme/templates directory?" while making any theme changes, as this forces smarty to regenerate its cache whenever it determines the file has changed.