Hey nostr:nprofile1qqsqe8j7zlaa74277sw670p6r9n5njzgl8rer9n0xrawtexqfq8gwzcwpgdv3 , The unknown people you see in your recent with replies section are people whom got replied from people you follow, if you have selected the thread view the unknown user will appear first

while if you change the view to the box view, your follow will appear first

You can always change how your thread appears, go to Settings > Customization > Feed settings > Replies view

If your issue differs from my above explanation, you can share screenshots or more details to help us debug it 🙏