I would recommend opening a TAC case so we can dig into this further, but can you share the XML config for the EPG showing the static path bindings?
I'm assuming the static path binding is deployed for both leafs vPC?
What hardware are you using?
Are you using VMM integration?
Are there any faults on the switches or EPG's pertaining to something along these lines?
In the "operational" tab of the EPG, on what interface is the EP learnt on?
Joey