Look under the playlist the Instagram feed is in and click the drop down arrow () on the right, then click onto ‘Settings’ on the right side of your Instagram, you will have an option to adjust the number of posts under ‘Show Latest __ Posts’, the number can be changed from 1 to 10, if you see outdated content it may be better to choose 1 or 2, and show the most recent 1 or 2 instagram posts. Click save when done.