hardcoded call to slideshow is showing multiple galleries

I have been using slideshow gallery to display the banner photos at https://steeplechasers.org (gallery_id 1). This has worked fine until I added another gallery for a different purpose (gallery id 2, see https://steeplechasers.org/membership/shirt-sale-august-2015/).

Now the following code displays both galleries. (maybe interesting that [tribulant_slideshow gallery_id="2" autoheight="true"] only displays the 2nd gallery)

<?php
            slideshow(true, null, false, array('layout' => 'responsive',
                                            'auto' => 'true',
                                            'gallery_id' => '1',
                                            'showthumbs' => 'false',
                                            'autospeed' => '6',
                                            'orderby' => 'random',
                                            'fadespeed' => '10',
                                            'showinfo' => 'false'));
            ?>

https://www.ads-software.com/plugins/slideshow-gallery/