Hi there,
Thanks for reaching out!
Please ensure that the users are not on your platform friend list outside of the game. If they aren't, please try clearing the console's cache to resolve the issue:
https://help.bungie.net/hc/en-us/articles/360049199051-Clearing-the-Console-Cache
If you're on Steam, you can clear the cache by going to Steam>Settings>Downloads>Clear Download Cache.
If you continue experiencing this after clearing the cache, please use your platform's feature to save a clip highlighting the issue and upload it to YouTube, then send us the link here. We'll be glad to pass it along to the developers for investigation.