diff --git a/webapp/models/Phase3Box.php b/webapp/models/Phase3Box.php
index 7d950911..3e5a61c6 100644
--- a/webapp/models/Phase3Box.php
+++ b/webapp/models/Phase3Box.php
@@ -79,13 +79,15 @@ class Phase3Box extends BaseModel {
         {
             $space = 0;
             for ($i = 0; $i < count($randArr); ++$i) {
-                $randArr[$i] += $space;
                 $space += $randArr[$i];
+                $randArr[$i] = $space;
             }
         }
         if ($row && $row['state'] == self::INIT_STATE) {
             $rnd = rand(0, 99);
             $rewardIdx = -1;
+            error_log(json_encode($randArr));
+            error_log('rand:' . $rnd);
             for ($i = 0; $i < count($randArr); ++$i) {
                 if ($rnd <= $randArr[$i]) {
                     $rewardIdx = $i;