command in .bashrc is being executed twice

I am using .bashrc to execute a python script on system boot:

sudo -u pi python3 /path/to/script.py

and then I add @lxterminal to file /etc/xdg/lxsession/LXDE-pi/autostart to make sure a terminal window is opened on launch. However, when I use ps aux to check all progresses, I found that there's two script.py processes running in the system, even though I call execute the script only once in .bashrc. Having two of the same script running at the same time is causing me troubles. Any help is appreciated.