Double request when connecting to a guest network

[Gidro76]

Good afternoon. We use openwrt 21.02 and coova-chilli 1.5-4 and faced such a problem - two requests from one device arrive to the authentication server, because of which it cannot be authorized
The problem seemed to be solved by disabling (not deleting) ipv6 on the web on the interfaces and with the commands:
uci set 'network.lan.ipv6 = 0'
uci set 'network.wan.ipv6 = 0'
uci set 'dhcp.lan.dhcpv6 = disabled'
/etc/init.d/odhcpd disable
uci commit
/etc/init.d/odhcpd disable
/etc/init.d/odhcpd stop
But after a while, the devices again send two requests. Has anyone encountered this and solved the problem?