I don't know how checkboxes are handled by ISPConfig now, but the problem is that a checkbox is submitted only if it is checked. For example, if a chackbox is checked, it would submit "1". Now you'd expect that it submits "0" if it isn't checked, but that's not the case; nothing gets submitted, as if the checkbox didn't exist.
A workaround would be to use a drop-down menu with the values "No" and "Yes" instead of checkboxes.
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