Mikrotik Advertise Problem

Hi, I have configured a RB433 to authenticate my Wireless clients through Radius by mac. In the radius I have set the attribute Mikrotik-Advertise-URL and Mikrotik-Advertise-Interval and it work perfectly, but the Client IPs are masquerade from RB IP. Can you help me?

PS. There aren’t Rules in Firewall-Nat or Firewall-Mangle that masquerade or nat IP Address.