In Inventor 2015, 2016, and 2017 drawing section views, some non-participating components are sectioned.
This is a known issue for Inventor 2015-2017 documented with Incident ID 140397
It's fixed in these updates or hotfixes:
Inventor 2015:
Inventor 2015-Update 6 for SP2
Inventor 2016
Inventor 2016-Hotfix 2.5
Inventor 2017:
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