update_post_meta from data in multidimensional array created from a form

First off, there’s a problem with your array. Arrays can not have duplicate keys. So, only the first key will be saved. You need to change your form to something like this. 

<input name="mainStageSatOrder[theband0][theid]" type="hidden" class="band-id" value="" />";
<input name="mainStageSatOrder[theband0][theorder]" type="hidden" class="band-order" value="" />";
<input name="mainStageSatOrder[theband1][theid]" type="hidden" class="band-id" value="" />";
<input name="mainStageSatOrder[theband1][theorder]" type="hidden" class="band-order" value="" />";

The array will look like this 

$array = array(
    'mainStageSatOrder' => array(
        'theband0' => array(
            'theid' => 1,
            'theorder' => 5
        ),
        'theband1' => array(
            'theid' => 2,
            'theorder' => 8
        )
    )
);

You don’t need a foreach loop while saving the meta data. You can instead save it as an array. WordPress will automatically serialize it for you.

$array = $_POST['mainStageSatOrder'];
update_post_meta( $postid, 'mainStageSatOrder', $array );

And, while retriving the values.. 

$data = get_post_meta($post->ID, 'mainStageSatOrder', true);

The returned $data will be an array.

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