Hi @Tony_Boy ,
Firstly, are you sure you update successfully?
Could you show me the Complete datacard's Update property?
It should be like: checkbox1.Value
Secondly, could you show me the checkbox's Default?
It should be like: Parent.Default
Thirdly, I suggest you refresh your data source after you update data.
Maybe data updating delay leads to this problem.
set the submit button's OnSelect:
SubmitForm(Form1);Refresh(datasource)
Best regards,