I apologise first if this is a stupid problem. I'm new to Cisco networking. I need some help with an existing configuration done by my vendor.

Environment:
1. Core switch - Catalyst 6509e
     vlans configured:
     a. vlan 50 (wired clients)
          10.0.50.x/24
          interface IP 10.0.50.20
     b. vlan 70 (wireless clients)
          10.0.70.x/24
          interface IP 10.0.70.20
     c. vlan 192 (guest clients)
          192.168.1.x/24
          interface IP 192.168.1.20
     d. trunk port for WLC
          native vlan 70
          allowed vlan 50, 70, 192

2. Cisco 4402 WLC
     interfaces
     a. management   untagged IP 10.0.70.10
     b. ap-manager   untagged IP 10.0.70.11
     c. service-port n/a      IP 192.168.10.1
     d. virtual      n/a      IP 1.1.1.1
     e. guestwlan    vlan192  IP 192.168.1.100

3. Cisco AIR-LAP1142N-S-K9
     LAP01 (WLAN local, interface: management)
          IP 10.0.70.21/24
          GW 10.0.70.20
          DHCP server 10.0.50.10 (scope 10.0.70.101 to 200)

     LAP02 (WLAN guest, interface: guestwlan)
          IP 192.168.1.21/24
          GW 192.168.1.20
          DHCP server 192.168.1.10 (scope 192.168.1.101 to 200)

here's the problem, wireless clients connected to WLAN guest keep getting DHCP leases from WLAN local 10.0.50.10 (scope 10.0.70.101 to 200)

can anyone please help? thanks!