Running things when ssh'd versus via the forge deploy script

I have nvm running my DO server managed by forge. I have node installed via nvm. When I run commands after sshing into the server with the forge user, it shows me that I am operating out of nvm. For example:

$ which node
/home/forge/.nvm/versions/node/v6.6.0/bin/node

$ which yarn
/home/forge/.nvm/versions/node/v6.6.0/bin/yarn

This is desired. However the forge deploy scripts do not use the same things. When I run the deploy scripts they are using:

which node
/usr/bin/node

First off why is this? And second how would I adjust the server so everything is running the correct version of the things.

Thanks!