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Autosize is a little different then you might expect for these fields. If the oa rates are autosized, in an OpenStudio style idf, the simulation will look "up" to the design oa specs attached to the zones. I suggest that you leave the oa controller fields autosized and use the design oa spec as outlined in this question.

https://unmethours.com/question/757/how-do-i-enter-in-design-specification-outdoor-air-in-openstudio/