diff --git a/src/openrct2-ui/scripting/CustomWindow.cpp b/src/openrct2-ui/scripting/CustomWindow.cpp
index 59811cd242..6f489b55b8 100644
--- a/src/openrct2-ui/scripting/CustomWindow.cpp
+++ b/src/openrct2-ui/scripting/CustomWindow.cpp
@@ -482,6 +482,8 @@ namespace OpenRCT2::Ui::Windows
                 }
                 widgetIndex++;
             }
+
+            UpdateViewport();
         }
 
         void OnPrepareDraw() override
diff --git a/src/openrct2-ui/scripting/ScViewport.hpp b/src/openrct2-ui/scripting/ScViewport.hpp
index 80165d24c4..77f2248623 100644
--- a/src/openrct2-ui/scripting/ScViewport.hpp
+++ b/src/openrct2-ui/scripting/ScViewport.hpp
@@ -271,7 +271,7 @@ namespace OpenRCT2::Scripting
             if (w != nullptr)
             {
                 auto viewport = w->viewport;
-                if (viewport != nullptr)
+                if (viewport != nullptr && (viewport->viewPos.x != left || viewport->viewPos.y != top))
                 {
                     viewport->viewPos.x = left;
                     viewport->viewPos.y = top;