It's due to a timing issue that has been fixed in latest release. Essentially, Evan made DS+ run so fast that it was moving faster than the users. I had over 7000DRK "stuck" due tot he same problem. It's no big deal. But, if it exists in your wallet already, you have to remove them. The updated wallet will respect them, it just won't make the mistake of creating more. It's up to you to determine what needs removed. Evan's way of making sure it didn't "automagically" remove something it shouldn't, then you'd REALLY be pissed...
How do I remove transactions?
In the debug console:
erasetransaction