That’s not what I’m seeing.
On my system your favicon doesn’t show on either Netlify or Vercel.
Both responses seem very similar:
Netlify
https://sftwareco.com/favicon.ico
Vercel
https://softwarecompanyv5.vercel.app/favicon.ico
There are favicon testers you can use that will help you debug.
Usually people find that the format of the image isn’t quite correct.
Take a look at:
https://realfavicongenerator.net/favicon_checker?protocol=https&site=sftwareco.com
Those kinds of tools can also help you generate favicons too if you’re struggling.