Every quote that is raised shows the Insurance tab. If a quote is turned into a Job then the Type is Insurance.
A check of Admin / Defaults / Manage Job Defaults - Insurance shows that some Insurance details have been set up.
Note how the Insurance Company Customer Type is set to **Unassigned**, this means that every Customer without a Type will activate the Insurance process.
Change the Insurance Company Customer Type to **Not Configured**
This will ensure that all Quotes that are created do not have the Insurance option.