Hi Meier,
Maybe you use a plugin for schema markup? I see the following Author schema on your blogpost:
on row 492.
I would start by removing this line of code and check the page again with the structured data testing tool: https://search.google.com/structured-data/testing-tool?hl=en#
I'm pretty shure that this is the reason for the 'penalty'. Had a similar experience ;).
Let me know the outcome!
Kind regards,
Robert