sflow NAT vs local subnet to reach MGMT station on another subnet...

So I went into CLI and still cannot find why the F5 is sourcing an interface that is not in the path to the sflow receiver:

sys sflow global-settings http { description none poll-interval 10 sampling-rate 1024 } sys sflow global-settings interface { description none poll-interval 10 } sys sflow global-settings system { description none poll-interval 10 } sys sflow global-settings vlan { description none poll-interval 10 sampling-rate 2048 } sys sflow receiver OpManager { address 10.10.10.16 app-service none description none max-datagram-size 1400 partition Common port sflow state enabled