Settting up virtual environment

i installed django on my virtual environment but when i deactivate the env and check my local machine, django is showing on my machine without installing django on it, please what can cause this?

steps i used to installed django on my virtual environment

1. i installed virtual env
2. create virtual environment with "virtualenv env" 3 i activate the env by using source env/bin/activate
3. then i installed django
4. i used django-admin to create my first project

so as i want to work on my second project i create new environment activate it but to my own suprise when i "pip freeze" to check whats inside the new Environment, it showing django and some other libraries i installed on the previous environment

please guys is this normal?