Can't remove property meta?

I created a “Test” property meta, which gives Attribute Name “Test” and slug “test”. I later go back and try to delete it by clicking “Delete Meta Attribute” on the far right. However, upon returning to the page, it is still there – just the Attribute Name is blank, but it still says “test” in the slug name field. I can try deleting it again, still there.

When I go to a property listing, there is a field for it there under General Information, with a text box to enter data in, but the label is blank in the left gray column. I don’t want this property meta field, how can I get rid of it?

https://wordpress.org/plugins/wp-property/