diff --git a/changelog.txt b/changelog.txt
index a463ccb..6a3903b 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -3,8 +3,8 @@ Version: 3.0.40
 Date: ????
   Changes:
     - Added unsafe modes for recipe functions, allowing the alteration of recipes regardless if the items/fluids exist.
-    - Add compatibility with AAI Signal Transmission. Now researched after
-      logistics science and uses contemporary ingredients
+    - Add compatibility with AAI Signal Transmission. Now researched after logistics science and uses contemporary ingredients
+    - Adjusted logic that determines the amount and name of a product to display with the "Add recipe signals" startup setting.
 ---------------------------------------------------------------------------------------------------
 Version: 3.0.39
 Date: 2025-09-15
diff --git a/data-final-fixes.lua b/data-final-fixes.lua
index 81affff..f0e8186 100644
--- a/data-final-fixes.lua
+++ b/data-final-fixes.lua
@@ -95,23 +95,26 @@ if create_signal_mode then
                     break
                 end
                 -- Determine amount of main product to display in signal name
-                amt = 0
+                local amt = 0
+                local main_product_name = recipe:get_main_product(true).name
                 for _, result in pairs(recipe.results) do
-                    if result.name then
-                        local is_main_product = recipe.main_product and result.name == recipe.main_product
-                        if is_main_product and result.probability and result.probability < 1 then
-                            amt = result.probability
+                    if result.name == main_product_name then
+                        if result.probability and result.probability < 1 then
+                            -- Some recipes have random amount for multiples, such as nuclear isotopes.
+                            local prob_amt = 0
+                            if result.amount then
+                                prob_amt = result.amount
+                            elseif result.amount_min and result.amount_max then
+                                prob_amt = (result.amount_min + result.amount_max) / 2
+                            end
+                            amt = result.probability * prob_amt
                             break
-                        elseif is_main_product and result.amount_min and result.amount_max then
+                        elseif result.amount_min and result.amount_max then
                             amt = (result.amount_min + result.amount_max) / 2
                             break
                         elseif result.amount then
-                            if is_main_product then
-                                amt = result.amount
-                                break
-                            end
-                            -- Fallback that determines main product based on highest output
-                            amt = math.max(amt, result.amount)
+                            amt = result.amount
+                            break
                         end
                     end
                 end
diff --git a/info.json b/info.json
index af7c4ef..5d2a18e 100644
--- a/info.json
+++ b/info.json
@@ -1,6 +1,6 @@
 {
     "name": "pypostprocessing",
-    "version": "3.0.39",
+    "version": "3.0.40",
     "factorio_version": "2.0",
     "title": "Pyanodons Post-processing",
     "author": "Pyanodon, Shadowglass, LambdaLemon",
diff --git a/lib/metas/recipe.lua b/lib/metas/recipe.lua
index 86ada2e..cd3f116 100644
--- a/lib/metas/recipe.lua
+++ b/lib/metas/recipe.lua
@@ -456,4 +456,4 @@ metas.get_icons = function(self)
     error(string.format("Couldn't find icons for recipe %s", self.name))
 end
 
-return metas
+return metas
\ No newline at end of file
diff --git a/locale/zh-CN/pypostprocessing.cfg b/locale/zh-CN/pypostprocessing.cfg
index 54dce45..b9ac626 100644
--- a/locale/zh-CN/pypostprocessing.cfg
+++ b/locale/zh-CN/pypostprocessing.cfg
@@ -1,4 +1,4 @@
-#汉化：aotix
+#汉化：aotix
 
 [mod-name]
 pypostprocessing=Py之后期处理