Try typing:
Code:ocnDisplay('analysis 'dc)
I suspect you'll find that there are multiple parameters for defining the sweep set.
This can happen if you have a .cdsenv file (e.g. in your home directory) which has been saved (via Options->Save Defaults in the CIW) when you had an ADE window open. This will have saved whatever ADE analysis setup you had as default values. OCEAN is then picking up these defaults, and adding the parameters you define - this quite likely means you have ended up with duplicate sweep specifiers.
Anyway, check for this .cdsenv file and see if you can locate it. You can then either remove the relevant entries, or delete the file altogether.
Best Regards,
Andrew.