Question-and-Answer Resource for the Building Energy Modeling Community
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You have updated your question and I understand it.
What is the zone mixing air flow rate [m3/s]? I think it is too large, such as 1m3/s. That's the cause of the dilution during occupied hours in your model. The smallest empty volume next to the occupied room is 3m3. If TimeStep in your model is 6 (i.e. 10min), I think the zone mixing air flow rate should be 3m3 / 10min = 0.005m3/s at maximum. larger values than 0.005m3/s are unrealistic given the logic of ZoneMixing and ZoneCrossMixing.
I'm not going to dig into this issue any further, but why don't you share your idf files, especially if you ask the developers for debugging? Your model doesn't appear to be confidential.
