pip packages installed but not available in pip freeze

I have created a virtual environment using virtualenv csip_project -p python3 and was trying to install the dependencies from a requirements.txt. Everything installs properly, but while executing the program it shows that module is not there. Then when I checked pip3 freeze to see if the dependencies are saved or not, to my surprise, they were not, even though the pip3 install command says Requirement already satisfied. Any idea what's going on? Here's the installation log and pip3 freeze output.

virtualenv csip_project -p python3

requirements.txt

pip3 freeze

Requirement already satisfied

pip3 freeze

(csip_project) [app-admin@ip-172-19-35-21 src]$ pip3 install -r requirements.txt
Requirement already satisfied: imutils==0.5.1 in /home/app-admin/csip_project/lib/python3.6/dist-packages (from -r requirements.txt (line 1)) (0.5.1)
Collecting numpy==1.15.1 (from -r requirements.txt (line 2))
Using cached https://files.pythonhosted.org/packages/fe/94/7049fed8373c52839c8cde619acaf2c9b83082b935e5aa8c0fa27a4a8bcc/numpy-1.15.1-cp36-cp36m-manylinux1_x86_64.whl
Collecting opencv-contrib-python==3.4.2.17 (from -r requirements.txt (line 3))
Using cached https://files.pythonhosted.org/packages/61/29/fc60b2de1713aa92946992544329f20ccb5e4ba26290f403e04b7da44105/opencv_contrib_python-3.4.2.17-cp36-cp36m-manylinux1_x86_64.whl
Collecting Pillow==5.2.0 (from -r requirements.txt (line 4))
Using cached https://files.pythonhosted.org/packages/d1/24/f53ff6b61b3d728b90934bddb4f03f8ab584a7f49299bf3bde56e2952612/Pillow-5.2.0-cp36-cp36m-manylinux1_x86_64.whl
Requirement already satisfied: tqdm==4.25.0 in /home/app-admin/csip_project/lib/python3.6/dist-packages (from -r requirements.txt (line 5)) (4.25.0)
Installing collected packages: numpy, opencv-contrib-python, Pillow
Successfully installed Pillow-5.2.0 numpy-1.15.1 opencv-contrib-python-3.4.2.17
(csip_project) [app-admin@ip-172-19-35-21 src]$ pip3 freeze
imutils==0.5.1
tqdm==4.25.0
(csip_project) [app-admin@ip-172-19-35-21 src]$


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