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VLAN DHCP Release> not assigns dhcp ip for the first attempt


I have a configured ISE with CWA enabled.   

I have a DHCP Server provides auto ip from (vlan-2)  to connect to my ISE and access to the Guest-Portal (that is a range from

I have another DHCP Server which provides auto ip from another range ( which is my Guest-VLAN

The issue we have is, while a guest user first connects to wifi, he gets an ip from my first-dhcp server (vlan-2) and is redirected to the Guest-Portal,  but as soon as he enters his user-credintials he is connected to the Guest-VLAN as shown on my ISE and WLC reports,   but the User does not get Guest-VLAN-IP from dhcp server.  unless he disconnects from the wifi and reconnect .

What can be the issue, why my users has to connect to the wifi twice to gets the guest vlan ip ?    althrough vlan dhcp replase option on my ise is correctly configured

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