Cannot delete https://sead2.ncsa.illinois.edu/collection/56ccabc4e4b0c3d1897ef51b from the https://sead2.ncsa.illinois.edu/collections page. I do have permissions on the space it is in, and can delete similar collections from their own pages (e.g. I think I could go to https://sead2.ncsa.illinois.edu/collection/56ccabc4e4b0c3d1897ef51b I can hit delete there and have it be deleted - that has worked for a different collection created the same way). The popup on the link says "Detach Delete the Collection" - not sure if this is a bad label or part of the bug.
This collection was created as a child collection of another one and was removed from that parent before I attempted to delete it. It works differently than collections I create from the collections page where I get the new confirm popup dialog and can delete.
These other collections do have the weird "Detatch Delete the Collection: popup text though.