diff --git a/src/pretix/control/forms/filter.py b/src/pretix/control/forms/filter.py
index 0d9cf0ada8..a5e7c2444c 100644
--- a/src/pretix/control/forms/filter.py
+++ b/src/pretix/control/forms/filter.py
@@ -244,10 +244,10 @@ class EventOrderFilterForm(OrderFilterForm):
         qs = super().filter_qs(qs)
 
         if fdata.get('item'):
-            qs = qs.filter(all_positions__item=fdata.get('item'), all_positions__canceled=False)
+            qs = qs.filter(all_positions__item=fdata.get('item'), all_positions__canceled=False).distinct()
 
         if fdata.get('subevent'):
-            qs = qs.filter(all_positions__subevent=fdata.get('subevent'), all_positions__canceled=False)
+            qs = qs.filter(all_positions__subevent=fdata.get('subevent'), all_positions__canceled=False).distinct()
 
         if fdata.get('question') and fdata.get('answer') is not None:
             q = fdata.get('question')