diff --git a/SpiffWorkflow/bpmn/specs/mixins/subworkflow_task.py b/SpiffWorkflow/bpmn/specs/mixins/subworkflow_task.py
index 6eaa57a2..05384011 100644
--- a/SpiffWorkflow/bpmn/specs/mixins/subworkflow_task.py
+++ b/SpiffWorkflow/bpmn/specs/mixins/subworkflow_task.py
@@ -65,7 +65,7 @@ def _on_cancel(self, my_task):
 
     def copy_data(self, my_task, subworkflow):
         start = subworkflow.get_next_task(spec_name='Start')
-        start.set_data(**my_task.data)
+        start.set_data(**deepcopy(my_task.data))
 
     def update_data(self, my_task, subworkflow):
         my_task.data = deepcopy(subworkflow.last_task.data)
diff --git a/SpiffWorkflow/bpmn/specs/mixins/unstructured_join.py b/SpiffWorkflow/bpmn/specs/mixins/unstructured_join.py
index 64be05b8..477ac1da 100644
--- a/SpiffWorkflow/bpmn/specs/mixins/unstructured_join.py
+++ b/SpiffWorkflow/bpmn/specs/mixins/unstructured_join.py
@@ -16,11 +16,11 @@
 # License along with this library; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 # 02110-1301  USA
+from copy import deepcopy
 
 from SpiffWorkflow.util.task import TaskState, TaskIterator
 from SpiffWorkflow.specs.Join import Join
 
-
 class UnstructuredJoin(Join):
     """
     A helper subclass of Join that makes it work in a slightly friendlier way
@@ -29,7 +29,8 @@ class UnstructuredJoin(Join):
     def _update_hook(self, my_task):
 
         may_fire = self._check_threshold_unstructured(my_task)
-        other_tasks = [t for t in my_task.workflow.tasks.values() if t.task_spec == self and t != my_task and t.state is TaskState.WAITING]
+        other_tasks = [t for t in my_task.workflow.tasks.values()
+                if t.task_spec == self and t != my_task and t.state is TaskState.WAITING]
         for task in other_tasks:
             # By cancelling other waiting tasks immediately, we can prevent them from being updated repeeatedly and pointlessly
             task.cancel()
@@ -43,16 +44,19 @@ def _update_hook(self, my_task):
 
     def _run_hook(self, my_task):
         other_tasks = filter(
-            lambda t: t.task_spec == self and t != my_task and t.has_state(TaskState.FINISHED_MASK) and not my_task.is_descendant_of(t),
+            lambda t: t.task_spec == self and t.has_state(TaskState.FINISHED_MASK) and not my_task.is_descendant_of(t),
             my_task.workflow.tasks.values()
         )
-        pass
         for task in sorted(other_tasks, key=lambda t: t.last_state_change):
             # By inheriting directly from parent tasks, we can avoid copying previouly merged data
-            my_task.data.update(task.parent.data)
+
+            my_task.set_data(**deepcopy(task.parent.data))
             # This condition only applies when a workflow is reset inside a parallel branch.
             # If reset to a branch that was originally cancelled, all the descendants of the previously completed branch will still
             # appear in the tree, potentially corrupting the structure and data.
             if task.has_state(TaskState.COMPLETED):
                 task._drop_children(force=True)
-        return True
\ No newline at end of file
+
+        # My task is not finished, so won't be included above.
+        my_task._inherit_data()
+        return True
diff --git a/SpiffWorkflow/task.py b/SpiffWorkflow/task.py
index 07d565d9..f3345668 100644
--- a/SpiffWorkflow/task.py
+++ b/SpiffWorkflow/task.py
@@ -313,7 +313,7 @@ def _assign_new_thread_id(self, recursive=True):
 
     def _inherit_data(self):
         """Copies the data from the parent."""
-        self.set_data(**self.parent.data)
+        self.set_data(**deepcopy(self.parent.data))
 
     def _set_internal_data(self, **kwargs):
         """Defines the given attribute/value pairs in this task's internal data."""