Hi,  We are having exactly the same issue.

Over 40+ pages have been removed from the indexed and this page has been selected as the google preferred canonical.

https://studyplaces.com/about-us/

The pages affected by this include:

https://studyplaces.com/50-best-college-party-songs-of-all-time-and-why-we-love-them/

https://studyplaces.com/15-best-minors-for-business-majors/

As you can see the content on these pages is totally unrelated to the content on the about-us page.   Any ideas why this is happening and how to resolve.