A couple of additional notes. First is that you are running an ancient version of RouterOS. Second is that RouterOS has the ability to detect rogue DHCP servers. You appear to be using WebFig, but it should at least be somewhat similar to WinBox. Under DHCP server > Alerts, you can set which interface you want to monitor for rogue DHCP server and set some parameters. When a rogue DHCP server is detected, you can trigger a script for what to do about it. In my case, the script sends me an E-Mail telling me about it.
/ip dhcp-server alert
add disabled=no interface=E02-pB4_101 on-alert="DHCP Alert" valid-server=\
6C:3B:6B:7E:99:86
add disabled=no interface=E03-pB6_103 on-alert="DHCP Alert" valid-server=\
6C:3B:6B:7E:99:87
And in case you really want it, here's the script that tells me about it.
:log info "Starting Rogue DHCP server script"
/tool e-mail send to="jim@<redacted>" body="$[/system clock get date] at $[/system clock get time] MikroTik RB4011 router has detected a rogue DHCP server. See event log." \
subject="RB4011 router found rogue DHCP server"
:delay 00:00:10
/tool e-mail send to="k6ccc@<redacted>" body="$[/system clock get date] at $[/system clock get time] MikroTik RB4011 router has detected a rogue DHCP server. See event log." \
subject="RB4011 router found rogue DHCP server"
:log info "DHCP alert script completed"