MAC+IP in firewall problem

RouterOS General
1

I use combination MAC+IP, to prevent clients to change ip.

143 X ;;; OM(MAC+IP)
     chain=forward action=accept src-address=192.168.76.182 
     src-mac-address=00:0C:42:2B:FC:55 

144 X chain=forward action=log src-mac-address=00:0C:42:2B:FC:55 
     log-prefix="changed-ip-OM" 

145 X chain=forward action=drop src-mac-address=00:0C:42:2B:FC:55

this client is using rb411+r52, but he doesnt change ip and it is showing this:

13:52:59 firewall,info info: changed-ip-OM forward: in:Local out:Local, src-
    mac 00:0c:42:2b:fc:55, proto UDP, 192.168.76.181:5678-
    >255.255.255.255:5678, len 93 
13:52:59 firewall,info info: changed-ip-OM forward: in:Local out:Local, src-
    mac 00:0c:42:2b:fc:55, proto UDP, 192
13:56:59 firewall,info info: changed-ip-OM forward: in:Local out:Local, src-
    mac 00:0c:42:2b:fc:55, proto UDP, 192.168.76.181:5678-
    >255.255.255.255:5678, len 93 
13:56:59 firewall,info info: changed-ip-OM forward: in:Local out:Local, src-
    mac 00:0c:42:2b:fc:55, proto UDP, 192.168.76.181:5678-
    >255.255.255.255:5678, len 93

I use on central AP rb532, ros2.9.54, client use ros3

2

what’s wrong? 192.168.76.182 and 192.168.76.181 are different addresses =)