Why can a ping lose packets depending on what subnet the src address is?

Question

D-Link

Good afternoon, there is a network in which vlans are configured for different needs, for these devices the switch (dlink) acts as a gateway, the switch has a gateway router (mikrotik), routing is configured via ospf. I found a very strange phenomenon when a ping is done to one of the devices via mikrotik (and not only), the src address is set to one of those registered on the router, packets are lost, but if you specify a different src address, pings pass without problems
example:
ping src-address= 192.168.1.2 address=192.168.2.1 - starts losing packets around 30%
ping src-address=192.168.1.3 address=192.168.2.1 - no loss
traces of their addresses are the same, maybe someone faced similar?