I launched CurseForge after not using it for a while, and went through the "new user" introduction (popups talking about privacy, selecting a folder to store CurseForge modpacks in, etc).
After this introduction, the "My Modpacks" area contained four modpacks which seem to be from previous versions/installations of CurseForge. However, I cannot launch or delete any of them - I just get an error saying "Failed to launch" or "Failed to delete profile".
I don't know where these profiles are stored on my computer, or how CurseForge found them. But if I can't interact with them in any meaningful way, they should not show up in the "My Modpacks" area.
EDIT: After installing a new modpack, the previous 4 invalid modpacks disappeared from "My Modpacks", so this issue is not as big a deal as I thought. It would still be a small UI/UX improvement, though.