I think I understand what you mean, but I need a clearer view of just how your network is set-up and what you are trying to achieve.
It appears at "first read" you are attempting to use two routers for effectively the same job. To try and use two DHCP servers is always a nightmare. You are inevitably going to get conflicts.
Think of it like this, your IP address is just like the number or name on your front door. A postman brings a letter for you, but on it are two different addresses. Which one does he deliver it to?