Why is everything I install in a virtual environment installed globally?

Question

Django

All the modules that I installed in the virtual environment - there was always an icon (my_env) on the right side of the command line - installed globally in the folder "C:\Users\admin\AppData\Local\Programs\Python\Python37-32\lib\site- packages".
I understand that in a good way the modules should have been installed in this folder: ...\my_env\Lib\site-packages.
In addition, when I pip freeze > requirements.txt all global modules are written to the file, the same thing happens when I want to download modules from requirements.txt - they are all installed in the global folder.
In general, the virtual environment behaves as if it does not exist at all, as if I run all commands directly from the usual command line.
How to fix it?
UPD: I understand that I can fix the problem by reinstalling Wirth. environment, but I'm wondering why this happens at all (before the environment worked fine).