WO: watch only
Make sure the WO and the offline wallet have the same address chain length and see if that fixes your issue.
If not, with coin selection (in expert mode), pick the addresses you want to spend from and make sure they are present in the Offline wallet. Then let me know how it all went.
Also, I'd like to see both the offline and online Armory log files. Do a File -> Export Log Files in both and send them to
support@bitcoinarmory.com