Different pageviews


I have a general question about page views and transitions.
I tried to look up the pageviews for a specific page with a date range (2017-01-01 - 2017-12-31).
It shows, that the site had 3246 pageviews in 2017, but the transition of this page only shows 237 pageviews.

My question is, how is this possible?

Please check the two screenshots.

Thanks and best regards