My guess is that your issues are not being "resolved".
The status you are seeing here says "resolved", but that is the status, which is not what Jira uses for this chart. This is looking at whether the issue is "resolved" as defined by whether the Resolution field has a value or not. If it is empty, the issue is unresolved, if it has any value set, then the issue is resolved. (Technically, last time I looked at the code, the gadget actually reads for the date that the resolution was set, but that's empty when the resolution is empty)
I suspect your workflow is not setting (or clearing) the resolution where it needs to
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