Can you please share your shortcode code ? the shortcode should have ob_start() & ob_get_clean() functions. please see the below shortcode syntax

function your_shortcode_function() {
    ob_start();
    ?>
    <div class="your-custom-shortcode-wrapper">
        <!-- Your output content here -->
    </div>
    <?php
    return ob_get_clean();
}
add_shortcode('your_shortcode', 'your_shortcode_function');

please let me know if it works