Foreman » Installer

I think this happens because the installer remembers the answers you chose the last time you ran it. This means that you should change these options, for example:

/etc/foreman-installer/scenarios.d/foreman-answers.yaml or /etc/foreman-installer/scenarios.d/katello-answers.yaml (depending on your installation)

will contain a key:

`foreman::plugin::puppetdb: true`

Change it to false and I think your problem will go away.

This is by design how the installer works and changing it would be a lot of work though you could use remove your answers and --dont-save-answers to achieve sort of what you want. If you want to change anything then there's --no-enable-foreman-plugin-puppetdb to disable it.