Widget display nothing

Your if statement is empty. Also I don’t think your if statement is correct.
Can you try this:

<?php if ( is_active_sidebar( 'sidebar-title-c' ) ) : ?>
    <p style="font-size: 12px;margin-top:-4px;font-weight: 900;color: #fff;border-bottom: solid 1px #02B4EA;padding-bottom: 5px;">
        <?php dynamic_sidebar( 'sidebar-title-c' ); ?>
    </p>
<?php endif; ?>

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