Why is my categories widget number so long?

Anyone know why the widget number on Categories and Text widget or such long numbers?
Like #categories-385838483834

The links one is just #linkcat-2

Is it caused by this somehow?:

if ( function_exists('register_sidebar') )
    register_sidebar(array(
        'before_widget' => '<div id="%1$s" class="sidewidget widget %2$s">',
        'after_widget' => '</div>',
        'before_title' => '<h3 class="widgettitle">',
        'after_title' => '</h3>',
    ));

https://www.sbgla.com/ is the site

Thanks for any help