LM5060: Problem with reverse current flow when doing power override with two LM5060 switches

Hi I am trying to build a power selection circuit where When Input A is above V-a threshold then input A will drive the combined output regardless of the voltage of B.  Otherwise input B will drive the combined output.  Also input A and Input B cannot feed back into each other (basically Input B must be isolated from Input A and Input A should override when it is active).

I have implemented this using two LM5060's and some control circuitry.  The individual power blocks are identical to Figure 41 in the datasheet, except for some logic circuitry on the Input A which drives the enable PIN on the LM5060 in the Input B subsystem.

My issue is that when Input A is below the UVLO threshold, and Input B is higher voltage than input A the entire Input A subsystem is backpowered vi the OUT sensor pin on the Input A LM5060.  This occurs because current flows through R8 in figure 41, powering the chargepump and driving the Q1 and Q2 into conductance.

My question is how I can I stop this?

Thanks,

Rob