Strange behaviour when developing SP framework apps

Hi,

I am just starting with SP framework and for me everything is right, for others in my same office not.

This is the strange part: we all created the dev. environmen following the same steps that are in the Microsoft's SP framework page. 

When I run the app with gulp serve, the app run at once, but for others not. They need to update serve.json and change from this: 

 

{
  "$schema": "https://dev.office.com/json-schemas/core-build/serve.schema.json",
  "port": 4321,
  "https": true,
  "initialPage": "https://localhost:5432/workbench",
  "api": {
    "port": 5432,
    "entryPath": "node_modules/@microsoft/sp-webpart-workbench/lib/api/"
  }
}

to this: 

 

 

{
  "$schema": "https://dev.office.com/json-schemas/core-build/serve.schema.json",
  "port": 4321,
  "https": true,
  "initialPage": "https://localhost:4321/temp/workbench.html",
  "api": {
    "port": 4321,
    "entryPath": "node_modules/@microsoft/sp-webpart-workbench/lib/api/"
  }
}

The updated fields are: initialPage and api.port

 

why is this happenning in theirs computers?

 

Regards

Americo