Ok, I fixed the issue.
After using the parameter:
requested-ip-interface-match
And commiting, restarting softly and gracefully DHCP server nothing worked better.
I had to manually clear BAD bindings from wrong pools.
I found them using the command:
root@SRX2# run show dhcp server binding | match reth0.100 | grep 192.168.4.
And then cleared each binding.