@Magic10Fingers I moved your post to the iOS app forum, a better fit for this issue. I see the same thing. There are four places to tap on Learn More in the micronutrients and calories section. This happens in all four. Please send feedback in the Fitbit app. Tap on your profile picture, then Send feedback.
This bug is taking you to a web page on your phone's web browser (Safari or whatever you use). Close you browser to return to the Fitbit app.
I flagged this post to get a moderator's attention and file a bug report.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.