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I know exactly this problem. First - You are using ZEOS 6.xxx, it's behavior is that after insert record default value is obtained from server, after post record default value is obtained from server again. Thats why value of field increases by 2. I suggest to install ZEOS 7 - all works fine, defaul...

Yes. Use ZUpdateSQL assigned to ZQuery as UpdateObject.
Set ZUpdateSQL.RefreshSQL statetment that select current reccord, for example:
SELECT * FROM table WHERE PrimaryKeyID=:PrimaryKeyID
After post reccord You can refresh it by: ZQuery1.RefreshCurrentRow(true)

reg. Enix