@bobbyau & @simo71 & @danielhagelin –
The number of photos was an existing display detail that was accidentally missed in a few recent versions. That issue was corrected, but it appears some, such as yourselves, do not appreciate the detail being there.
Since there is no easily identifiable CSS element to address, you can look at either creating a custom template (recommended) or modifying the existing album-compact.php
template.
Look at the following:
<?php if (@$gallery->counter > 0) : ?>
<p><strong><?php echo $gallery->counter ?></strong>?<?php _e('Photos', 'nggallery') ?></p>
<?php endif; ?>
Either set the value of 0 (zero) to something insanely high, for example 100000, or remove the three lines altogether. Either way it should stop the number of photos from appearing under the Gallery thumbnail in the compact album. This would also be similar for the Extended album, too.
– Cais.