latest changes not showing on Netlify after deployment - reactjs

Question

This is my first time deploying a react js app to Netlify and I'm facing some issues.
every time I try to push new commits to GitHub Netlify automatically deploys it but the changes don't seem to take effect for some reason.
Here's the deployment log:
2:03:20 PM: Waiting for other deploys from your team to complete
2:03:41 PM: Build ready to start
2:03:43 PM: build-image version: ca811f47d4c1cbd1812d1eb6ecb0c977e86d1a1d
2:03:43 PM: build-image tag: v3.3.20
2:03:43 PM: buildbot version: be8ecf2af866e16fa4301cc5c14de2ccbbb21cf4
2:03:43 PM: Fetching cached dependencies
2:03:43 PM: Starting to download cache of 114.5MB
2:03:45 PM: Finished downloading cache in 1.515845861s
2:03:45 PM: Starting to extract cache
2:03:50 PM: Finished extracting cache in 5.156934064s
2:03:50 PM: Finished fetching cache in 6.69538965s
2:03:50 PM: Starting to prepare the repo for build
2:03:50 PM: Preparing Git Reference refs/heads/master
2:03:52 PM: Different publish path detected, going to use the one specified in the Netlify configuration file: 'build' versus 'build/' in the Netlify UI
2:03:52 PM: Starting build script
2:03:52 PM: Installing dependencies
2:03:52 PM: Python version set to 2.7
2:03:52 PM: Started restoring cached node version
2:03:55 PM: Finished restoring cached node version
2:03:55 PM: v12.18.0 is already installed.
2:03:56 PM: Now using node v12.18.0 (npm v6.14.4)
2:03:56 PM: Started restoring cached build plugins
2:03:56 PM: Finished restoring cached build plugins
2:03:56 PM: Attempting ruby version 2.7.1, read from environment
2:03:57 PM: Using ruby version 2.7.1
2:03:57 PM: Using PHP version 5.6
2:03:57 PM: 5.2 is already installed.
2:03:57 PM: Using Swift version 5.2
2:03:57 PM: Started restoring cached node modules
2:03:57 PM: Finished restoring cached node modules
2:03:58 PM: Started restoring cached go cache
2:03:58 PM: Finished restoring cached go cache
2:03:58 PM: go version go1.14.4 linux/amd64
2:03:58 PM: go version go1.14.4 linux/amd64
2:03:58 PM: Installing missing commands
2:03:58 PM: Verify run directory
2:03:59 PM: ​
2:03:59 PM: ┌─────────────────────────────┐
2:03:59 PM: │ Netlify Build │
2:03:59 PM: └─────────────────────────────┘
2:03:59 PM: ​
2:03:59 PM: ❯ Version
2:03:59 PM: #netlify/build 3.0.1
2:03:59 PM: ​
2:03:59 PM: ❯ Flags
2:03:59 PM: deployId: 5f16bd6759d4ae00096bdb64
2:03:59 PM: mode: buildbot
2:03:59 PM: ​
2:03:59 PM: ❯ Current directory
2:03:59 PM: /opt/build/repo
2:03:59 PM: ​
2:03:59 PM: ❯ Config file
2:03:59 PM: No config file was defined: using default values.
2:03:59 PM: ​
2:03:59 PM: ❯ Context
2:03:59 PM: production
2:03:59 PM: ​
2:03:59 PM: ┌───────────────────────────────────┐
2:03:59 PM: │ 1. Build command from Netlify app │
2:03:59 PM: └───────────────────────────────────┘
2:03:59 PM: ​
2:03:59 PM: $ npm run
2:03:59 PM: Lifecycle scripts included in cortex_app:
2:03:59 PM: start
2:03:59 PM: react-scripts start
2:03:59 PM: test
2:03:59 PM: react-scripts test
2:03:59 PM: available via `npm run-script`:
2:03:59 PM: build
2:03:59 PM: react-scripts build
2:03:59 PM: eject
2:03:59 PM: react-scripts eject
2:03:59 PM: ​
2:03:59 PM: (build.command completed in 303ms)
2:03:59 PM: ​
2:03:59 PM: ┌─────────────────────────────┐
2:03:59 PM: │ Netlify Build Complete │
2:03:59 PM: └─────────────────────────────┘
2:03:59 PM: ​
2:03:59 PM: (Netlify Build completed in 322ms)
2:03:59 PM: Caching artifacts
2:03:59 PM: Started saving node modules
2:03:59 PM: Finished saving node modules
2:03:59 PM: Started saving build plugins
2:03:59 PM: Finished saving build plugins
2:03:59 PM: Started saving pip cache
2:03:59 PM: Finished saving pip cache
2:03:59 PM: Started saving emacs cask dependencies
2:03:59 PM: Finished saving emacs cask dependencies
2:03:59 PM: Started saving maven dependencies
2:03:59 PM: Finished saving maven dependencies
2:03:59 PM: Started saving boot dependencies
2:03:59 PM: Finished saving boot dependencies
2:03:59 PM: Started saving go dependencies
2:03:59 PM: Finished saving go dependencies
2:03:59 PM: Build script success
2:03:59 PM: Starting to deploy site from 'build'
2:03:59 PM: Creating deploy tree
2:03:59 PM: Creating deploy upload records
2:03:59 PM: 0 new files to upload
2:03:59 PM: 0 new functions to upload
2:03:59 PM: Starting post processing
2:03:59 PM: Post processing - HTML
2:04:00 PM: Post processing - redirect rules
2:04:00 PM: Post processing - header rules
2:04:00 PM: Post processing done
2:04:00 PM: Site is live
2:04:19 PM: Finished processing build request in 36.032433755s
the latest commit is 9421ef1 and the changes are visible on the GitHub repo. so what might be the problem in case somebody else was facing a similar issue?

Answer 1

It looks like your netlify build command is set to npm run, that needs to be npm run build for Netlify to know how to build your React app into a production site.
You can change that in your netlify.toml or in your Build Settings on the Netlify website.