One computer on the network does not see Mikrotik. Why?

Question

System administration

There is a computer in a network. He sees all the Mikrotiks around but does not see the gateway. I also do not see this computer with Mikrotik directly. but right now, at the moment, through the winbox, we saw the gateway, went from this computer to the microt, we ping ourselves - "timeout" hahaha. guys how so?
DHCP and DNS is distributed from the server if anything. We see the server well)

Answer 1

I saw on the microte in the arp table that it is connected by statics and all the rest are in dynamics. removed. he rewrote it into dynamics, everything worked. perhaps the reason is in a crookedly closed record in the arp table. as a variant, let's think about what it could be