Fix models counter

app.py

@@ -146,7 +146,8 @@ st.sidebar.image("logo.png", width=200)
 st.markdown("# The 🤗 Speech Bench")
 
 st.markdown(
-    f"This is a leaderboard of **{len(dataframe)}** speech recognition models and **{len(dataframe['dataset'].unique())}** datasets.\n\n"
+    f"This is a leaderboard of **{dataframe['model_id'].nunique()}** speech recognition models "
+    f"and **{dataframe['dataset'].nunique()}** datasets.\n\n"
     "⬅ Please select the language you want to find a model for from the dropdown on the left."
 )