Forgive me if this is a dumb question, but I've never seen this before. I have some phantom metabox tab above my SEO Press part on my default WP Posts type.
Has anyone ever seen this before?
Here's a loom of what i'm seeing (comparing the affected site to another one)
Meta Boxes is the standard section of WordPress itself, which will show all registered meta boxes (field groups) and it can be collapsed or expanded as you do in the screen record.