Bonding plus EoIP 4 ping

Good day.
I have two mikrotiks. One has 1 WAN, another has 2 WANs
There are 2 EoIP tunnels:

  1. Router1 WAN1 - Router2 WAN1
  2. Router1 WAN1 - Router2 WAN2
    I made bonding (broadcast) of these two EoIP tunnels and placed this bonding into bridge of each of routers.
    Now everything seems to work. But when i am pinging from router1 any computer connected to router2, i`v got 4 ping replies instead of 1.
    Same situation vice versa (from router2 to router1).
    Pinging inside of one bridge is ok.