resources/views/components/tomselect.blade.php

@@ -22,7 +22,9 @@
                     field: 'text',
                     direction: 'asc',
                     func: function(a, b) {
-                        return a.text.localeCompare(b.text, undefined, {numeric: true, sensitivity: 'base'});
+                        const a_val = a.text.split(' - ')[0];
+                        const b_val = b.text.split(' - ')[0];
+                        return parseInt(a_val, 10) - parseInt(b_val, 10);
                     }
                 }]
             });