May be related to issue #148.
Any profile added to Geni from SmartCopy throws a JSON error. The profile does get added, but any subsequent operation fails to happen (e.g. if adding 1st parent, the 2nd parent does not get added ... or, if adding a spouse, no marriage info and no children will get added).
Since adding multiple siblings (or children or spouses) all are sent out "in parallel", most of time all the "add" requests do happen, but the error(s) stop any further actions from happening.