help ARP....problem....?

i’ve got 3 router 2 mikrotik (a and b) 1 cisco router in my office…!
mikrotik b is for experiment and mikrotik a is the real thing..!
i set ARP=reply-only
the problem is when i go to ip arp so many ip r shown (dynamic) means:
the ip that i write in arp n from the other routers…are shwon
why ip of the mikrotik b n cisco are seen in mikrotik a…!
can i just grouping each router so that each router dont connect…so the dynamic ip doesnt shown in mikrotik a..?

im sorry if i making u all canfusing bout my question…cause i ve tried in 2 days n no result…n my brain is almost blown…!