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I believe the issue is that both nodes are publishing to the same topic simultaneously. Since the topic name of each node is not a parameter, you cannot change the topic in the standard way. Instead, you must use the following in your launch file:

<node pkg="openni_camera" type="openni_node" name="openni_node1" output="screen" launch-prefix="$(arg launch_prefix)">
   <remap from="camera/depth/points" to="camera/depth/points1" />
   ...
</node>

<node pkg="openni_camera" type="openni_node" name="openni_node2" output="screen" launch-prefix="$(arg launch_prefix)">
   <remap from="camera/depth/points" to="camera/depth/points2" />
   ...
</node>