Millions of people use the famous social media site Instagram every day. However, it's not unusual to run into problems with this app.
You may not be able to view new posts from your followers due to this annoying problem.
So, for this, you may try refreshing your feed by swiping it down on the screen this was the first step. But if it does not work then try logging out of your account and then back in again.

Source: https://getassist.net/instagram-could-not-refresh-feed/