Running a different Node.js version when I explicit asked to run on Node 12

Guys I have explicit set the project to run on Node 12, however then while building (clear cache and built) it gives this error:

Warning: netlify-plugin-inline-functions-env will be executed with Node.js version 18.18.2
11:58:49 AM:   The plugin cannot be executed with your defined Node.js version 12.22.12

So I am not sure where Node.js version 18.18.2 comes from?

Many thanks in advance!