Force 1 worker for all estimates

gui/translation_tab.py

@@ -414,7 +414,8 @@ class TranslationWorker(QThread):
                     total_cost = "Success"
                 else:
                     # Default behavior: run each file in a separate process (unchanged)
-                    max_workers = threads
+                    # Use single worker for estimate mode to prevent race conditions
+                    max_workers = 1 if self.estimate_only else threads
                     self.executor = ThreadPoolExecutor(max_workers=max_workers)
 
                     # Submit tasks to run modules in separate processes

modules/main.py

@@ -178,7 +178,10 @@ files to translate are in the /files folder and that you picked the right game e
             pass
     except Exception:
         pass
-    with ThreadPoolExecutor(max_workers=THREADS) as executor:
+    
+    # Use single worker for estimate mode to prevent race conditions
+    max_workers = 1 if estimate else THREADS
+    with ThreadPoolExecutor(max_workers=max_workers) as executor:
         futures = []
         files_root = "files"