WP_Query min and max values

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Depending on the way your script is recording max_price, it isn’t really a meta_key/meta_value on postmeta table.

Did you try changin max_price clause to something like this?

['max_price'] => [
    'relation' => 'OR',
    [
        'key' => 'max_price',
        'value' => 11,
        'compare' => '<=',
    ],
    [
        'key' => 'max_price',
        'compare' => 'NOT EXISTS',
    ],
],

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