Unless you made a typo with pasting here, your pool3 has a very strange range...
add name=pool3 ranges=220.127.116.11-192.168.30.159
But the mikrotik records in its log it is assigning hte IP, and the IP appears in the leases list of the mikrotik...It looks like you have a second server, dhcp1, maybe it is configured somewhere on a bridged network?
OK. Thank you. What about RBxxx routers?Your routing with a switch! The CRS is not designed to route your maxing out the CPU.
Bridge it don't route in a CRS, or use a MT router, CCR, etc