The Last Assignment to Resolution time returns bad results. The line highlighted is an outbound ticket, assigned to the agent who made it, and was solved the same day. The report says nobody was assigned to it, and it was solved -1 days before it was assigned. 
Is this a known issue?
Last Assignment to Resolution Time Stamp Bad Results
The problem is, the prebuilt metric for "Last Assignment to Resolution" doesn't handle multiple resolutions well. The ticket was assigned and resolved, and then re-opened, unassigned, and re-resolved. It decided to use the un-assigning as the "assigned" timestamp, and used the first resolution for resolution. That's completely wrong. This metric is non-functional if you ever have multiple resolutions. If I can figure out how to write a functional one (unlikely given the number of bugs with custom formulas), I'll update here.
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