It might mean that the the issues used a workflow with different transitions to the Done status and that one transition had a Post Function to populate the Resolution field and one didn't.
I would start by looking at the transition(s) to Done in your workflow.
Few times this has happened to me was always because my transition to "released to prod" did not have the resolution = done. The easiest way to see it would be to sleect those specific issues and look at the workflow on those issues - for each workflow I had to update the transition separetely.
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