[Q] [HELP] Supersu keep reinstalling topic

Hi,
i have a international version of htc one m8 that i just bought, I rooted it and then found out that i didnt like rooting it, so i just unrooted it and flashed the stock recovery back. However, every time i rebooted the phone, the supersu app keep on coming back up and i have to unroot it again every time i restart my phone. Please can someone help me. Many thanks.