The 'Instances' metric in Correlation Report is actually Page Views, as it states 'SHOW PAGE VIEWS FOR THIS ITEM CORRELATED WITH:'. So it would be clear to use 'Page Views' instead of 'Instances' for the metric.
you can correlate props that were never set on a page view but on link calls. So Instances is the correct metric.
Thank you for your comment. I am sorry for not replying sooner.