diff --git a/renderer.php b/renderer.php
index 9232c20..0af2340 100644
--- a/renderer.php
+++ b/renderer.php
@@ -679,14 +679,14 @@ public function display_range_score($mode, $levels, $sortlevels, $isranged = fal
                         }
                     } else {
                         if ($sortlevels) {
-                            $previousScore = $levelsonly[$levelkey - 1]['score'] + 1;
-                            $a->rangestart = $previousScore;
+                            $previousscore = $levelsonly[$levelkey - 1]['score'] + 1;
+                            $a->rangestart = $previousscore;
                             $a->rangeend = $level['score'];
                             $levels[$level['id']]['score'] = get_string('levelrange', 'gradingform_rubric_ranges', $a);
                         } else {
-                            $nextScore = $levelsonly[$levelkey + 1]['score'] + 1;
+                            $nextscore = $levelsonly[$levelkey + 1]['score'] + 1;
                             $a->rangestart = $level['score'];
-                            $a->rangeend = $nextScore;
+                            $a->rangeend = $nextscore;
                             $levels[$level['id']]['score'] = get_string('levelrange', 'gradingform_rubric_ranges', $a);
                         }
                     }