When an Unfuddle user resolves a ticket, there is the option to “Close Ticket Simultaneously”. If this is toggled on, the “Resolution” and “Description of Resolution” are both lost to the Audit Trail; the Audit has no Resolution entry, but jumps right to Ticket Closed.

The workaround, certainly, is not to toggle the “Close Ticket Simultaneously”. I would think, however, that ANYTHING that fails to be included in the Audit trail would be considered a bug. Refer to this related issue: http://unfuddle.com/community/forums/3/topics/208
When closing ticket simultaneously, I think it should make two entries in the Audit Trail, one for Resolution and one for Closed.