Helo @Mohanms , MX2 is normally passive and should not handle any traffic unless MX1 is down .
if the MXs are connected to the same ISPs check the cabling , check if you have misconfigured a vip for the MXs, if you disable MX2 as a spare, what's the output of the Tshoot ? are you sure that the MX1 and 2 see each other through LAN (VRRP) and are on master/spare mode ? they may be both on master mode and you have an asymmetric routing . I think that a deep Tshoot can show what's wrong in this case , if all is good, I suggest that you ask for Meraki support help .