InDesign CC 2018
When I load styles from an existing document (one that got designed for me, and therefore has lots of styles that I need to reuse) the style in the new document contains lots of random additional settings.
The doc in question is MSM - Front and Back matter (attached). To recreate the issue, simply export any paragraph (or other) style into a different document and check out the extraneous formatting.
Attached files: Snip of an original style, snip of a style loaded to new doc, and the InDesign doc in question.
Also see thread from online forum: https://community.adobe.com/t5/InDesign/Imported-styles-contain-unwanted-formatting/m-p/10637103