Possibly.
Can you see the issues if you go to them directly? What, exactly, does your filter say?
At a random guess though, I think you might be looking at the "assigned to me" standard filter, which *actually* says "assigned to me AND unresolved". Could you look at the "resolution" field for one of the "missing" issues? If it's resolved, it won't appear in the "assigned to me" list...
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