Adjusting extrusion width should fix that. Also like peggyb says probably the radius isn't a number divisible by the nozzle size you have.
To force infill on gaps you can raise the % of Thin wall behavior in Advanced tap - Allow gap fill when necessary.
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peggyb 171
if you make the wall line count (or wall thickness) a high number, like 99, do you seethe same? If so, there is still something inside your model that doesn't belong there.
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