diff --git a/app/filter.py b/app/filter.py
index cdf627b..e7f9b57 100644
--- a/app/filter.py
+++ b/app/filter.py
@@ -11,15 +11,14 @@ def _filter_group(name: str, titles: list[str], group: str) -> bool | None:
     return None
 
 def _filter_event(name: str, td_group: str, sh_group: str) -> bool:
-    res = _filter_group(name, sh_titles, sh_group)
-    if res:
-        return True
+    res = _filter_group(name, td_titles, td_group)
+    if res is not None:
+        return res
 
-    elif res == None:
-        if _filter_group(name, td_titles, td_group) != False:
-            return True
+    if _filter_group(name, sh_titles, sh_group) == False:
+        return False
 
-    return False
+    return True
 
 def filter_calendar(calendar: Calendar, td_group: str, sh_group: str) -> Calendar:
     filtered_calendar = Calendar()