Inspections from the profile you select as the default are copied to the project default profile when the new project is created. There is an open issue about that:
Your specific problem is described under ISSUE 5:
There doesn't seem to be a way to set a global profile as the default
for new projects such that the project continues to use the global
default. If on the default settings dialog I set my profile to "My
Standard Inspections", when I create a new project, the settings I
have in "{idea.home}/inspections/My Standard Inspections.xml" are
copied to ".idea/inspections/Project_Default.xml". While I can
understand this might be desired behavior for teams that want a
standard inspection profile used for a project and for it to be shared
via VCS, that is not the case for me (and my co-workers). I want a
global profile that all my projects use such that as I tweak my
inspection profile over time, all projects use the updated profile (as
they are using a common global profile). This is the paradigm I've
used since IDEA v3. But it's broken down recently because of the
reworking of inspection profile management. While I could go in and
change the inspection profile from "Project Default" to "My Standard
Inspections" each and every time I create a new project, that is a
real pain, and is error prone. I think there needs to be an option to
select the behavior for the default profile setting to either "Use as
a global profile" or "Copy to project default profile".
We've also created a separate issue for this problem, please follow for updates:
- IDEA-170928 Default inspection profile isn't applied for a new project