You seem to be running into CSCef16357, which is caused by an ASIC limitation on the Sup720. This should only happen when "no tag ip propagate-ttl" is configured on the ingress PE (home PE in your scenario).
We also see that behavior with sup720-3bxl. Whenever such a switch does PHP it also decreases the ttl of the resulting packet (what it shouldn't). If this is an IP-Packet the switch sends a packet with ip ttl=0(!).
Is there any workaround? Besides replacing the sup720? This seems to me like a show-stopper for the sup720 in an MPLS enviroment. Any HW upgrades that solve this issue planned?
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