Can you see the IAM list?
If you can't add/remove permissions nor delete the project, but you can do other actions, it looks like you have editor/viewer access.
Check the list of editors and viewers for google groups (<something>@
googlegroups.com), and check if you're a member of any of those groups.
I suspect you recently joined a group that is an editor/viewer of that project, and this is why it now appears in your list of projects.
On the other hand, it could be that a group that you've been a member for a long time was just added as editor/viewer, and this is why it now appears in your list.
It could be that the project is in an organization where you don't have organization viewer permissions (resourcemanager.organizations.get.), and this is why it is shown in the "no organization" list. It could also be that the project is not under any organization. You can check by running `$gcloud projects describe <project-id>` and seeing if that project has a "parent id".