diff --git a/speedtester.py b/speedtester.py
index 942f431..f2b65ad 100644
--- a/speedtester.py
+++ b/speedtester.py
@@ -59,8 +59,8 @@ def generate_diff(dates, downloads, uploads):
         curr = downloads[i] if downloads[i] else 0
         prev = downloads[i-1] if downloads[i-1] and i > 0 else 0
         dl.append(curr - prev)
-        curr = downloads[i] if downloads[i] else 0
-        prev = downloads[i - 1] if downloads[i - 1] and i > 0 else 0
+        curr = uploads[i] if uploads[i] else 0
+        prev = uploads[i - 1] if uploads[i - 1] and i > 0 else 0
         up.append(curr - prev)
     generate_plot_image(dates, dl, up, "diff", "Difference Graph")
 
@@ -86,7 +86,7 @@ def gather_week_median_data(dates, downloads, uploads):
     for i, date in enumerate(dates):
         hour = date.hour
         dl[hour].append(downloads[i] if downloads[i] else 0)
-        up[hour].append(uploads[i] if downloads[i] else 0)
+        up[hour].append(uploads[i] if uploads[i] else 0)
 
     for i, hour in enumerate(dl):
         dl[i] = median(dl[i]) if len(dl[i]) > 0 else 0
@@ -114,7 +114,7 @@ def generate_week_median_diff(dates, downloads, uploads):
             downs.append(dl[i]-dl[i-1])
             ups.append(up[i]-up[i-1])
         else:
-            downs.append(down)
+            downs.append(dl[i])
             ups.append(up[i])
 
     generate_updown_plot_simple(downs, ups, "week_median_diff", "Week median diff")