It is an old issue, that I haven't seen for awhile. Yes, as others have said, be careful! If you see 2 reservations and you want 1 - do not delete 1 of them - they will both be gone. I am not aware of an associated accounting issue (as was reported pre-voyager). But it sure is not good if you delete a reservation that you wanted.
I am also seeing a past reservation in my current list of reservations. Another old (and I thought resolved) issue. It's a Dec 2-4 reservation, just hanging out.
This software is just so bad. It was never good, and now they are 'enhancing it' (points protection for one thing). Expect this kind of crap moving forward. This is what happens when you fail to stabilize and continue to build on a crappy foundation.
It looks like maybe some developer pulled in an older version of code - some type of version control issue. Pretty scary to see these issues coming back like this.