I was able to see your pages and the behavior you were referring to. Whenever you click on the products link in the menu it will take you to the results page with the previous results showing. If you would like this link to function the exact same as the show all products link you will need to do the following:
Open up the CSSMenuWriter > cssmw_home > menu.php file, in here update line 88 from this:
<li class="parent"><span><a href="<?php echo($assumedRoot); ?>Products_Results.php">Products</a></span>
to this:
<li class="parent"><span><a href="<?php echo($assumedRoot); ?>Products_Results.php?Search=0">Products</a></span>
Please let us know if there are any further issues with this.