why do i have to install bcrypt everytime i pull my repository? [on hold]

So the case is as follows :

1. I push my code to my repository from my computer
2. I pull it from my repository to my remote server
3. I run the command node app.js.

Normally at the third phase my application would be running in my own computer without no problems however when I am trying to do so in my remote server I am obliged to reinstall bcrypt package every time. Is there something wrong that I am doing or does it happen to everyone?

via Ozan