Locations not covered by other zones issue

I have custom made regions for zimbabwe which pics well on creating new zones. But on checking out the customised zones seem not to work because the cost of shipping will be calculated using the default last option. The return message is “Customer matched zone “Locations not covered by your other zones”. This happens even if i set different shipping methods like Flatrate, WooGrabExpress.
However if i set the global region, that is, Zimbabwe and not use customised zones within Zimbabwe, it will work

I used the below hook to create customised regions
add_filter( ‘woocommerce_states’, ‘custom_woocommerce_states’ );

function custom_woocommerce_states( $states ) {

$states[‘ZW’] = array(
‘ZW1’ => ‘Harare’,
‘ZW2’ => ‘Avondale’,
‘ZW3’ => ‘Gweru’,
‘ZW4’ => ‘Kwekwe’,
‘ZW5’ => ‘Vic Falls’
);

return $states;
}

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