There isn’t a way around this directly. The reason this happens is that ACF stores the values as an array, like this
$field['choices'] = array( 2850 => 'Aarons Pass' 2176 => 'Abbotsbury'. 2046 => 'Abbotsford', 2795 => 'Abercrombie', 2795 => 'Abercrombie River', 2325 => 'Aberdare', 2359 => 'Aberdeen', 2336 => 'Aberdeen', 2350 => 'Aberfoyle', )
anywhere you have two array indexes of the same value some of them will be cancelled out.
I’d suggest using values like ‘2759-1’, ‘2795-2’, or something else that will uniquely identify them and then deal with this in your PHP code.
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