That’s not proper way of doing it. Proper way is to use single bridge with vlan-filtering=yes, with appropriate pvid set for individual ports (e.g. wlan2, wlan4, …), bridge set as tagged member of appropriate VLANs and /interface vlan anchored to bridge. Then IP stuff (address, DHCP server, …) is bound to appropriate VLAN interface.
Everything according to this fine tutorial.