Having 2 SSID enabled causes issues

xiaomi mi mini router ( https://openwrt.org/toh/hwdata/xiaomi/xiaomi_mini_v1 ) Flash MB: 16 , RAM MB: 128

It has too wlan - wlan0 - 5G, wlan1 - 2.4G
If both are enabled and have different SSID , then I get an issue where devices can't see one or the other SSID. One can see 5G, other similar android 10 device can't see 2G. If the 2.4 wlan is disabled all is well. If I set them to same SSID then there is no issue except for speed tanking.

 cat  /etc/config/wireless

config wifi-device 'radio0'
        option type 'mac80211'
        option hwmode '11a'
        option path 'pci0000:00/0000:00:00.0/0000:01:00.0'
        option htmode 'VHT80'
        option txpower '20'
        option country 'IN'
        option channel '116'

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option ssid '5'
        option key ''
        option encryption 'psk+ccmp'
        option disassoc_low_ack '0'

config wifi-device 'radio1'
        option type 'mac80211'
        option hwmode '11g'
        option path 'platform/10180000.wmac'
        option txpower '20'
        option __toggle 'Enable'
        option country 'IN'
        option htmode 'HT20'
        option legacy_rates '0'
        option channel '6'

config wifi-iface 'default_radio1'
        option device 'radio1'
        option mode 'ap'
        option network 'lan'
        option disassoc_low_ack '0'
        option short_preamble '0'
        option skip_inactivity_poll '1'
        option key ''
        option encryption 'psk+tkip+ccmp'
        option ssid '2'
        option wmm '0'

If they have the same MAC, Android gets confused. Check with ip link show. If MACs are the same, change one using option macaddr.