Unwanted traffic hitting external interface proxy arp addresses

Hi,

I have a fixed external ip on the external interface of our SRX device, I recently set up a default deny rule so i can monitor traffic on a syslog server.

I am seeing lots of telnet and ssh traffic being denied not on our main ip but on the proxy arp addresses that i set up.

Im now a bit worried that something could get through, have i done something wrong?

Thanks