Update app.py

app.py

@@ -257,7 +257,8 @@ elif app_choice == "📊 Protein Comparator":
             diff_data.append(diff_row)
 
         result_df = pd.DataFrame(diff_data)
-        st.dataframe(result_df.style.format("{:.2f}%"))
+        percent_cols = result_df.select_dtypes(include='number').columns
+        st.dataframe(result_df.style.format({col: "{:.2f}%" for col in percent_cols}))
 
         def to_excel_with_colors(df):
             output = BytesIO()