diff --git a/services/transaction_builder.py b/services/transaction_builder.py
index 2aa879c..c33485b 100644
--- a/services/transaction_builder.py
+++ b/services/transaction_builder.py
@@ -201,9 +201,8 @@ class TransactionBuilder:
         self._current_roster: Optional[TeamRoster] = None
         self._roster_loaded = False
 
-        # Cache for pre-existing transactions
+        # Pre-existing transactions (re-fetched on each validation)
         self._existing_transactions: Optional[List[Transaction]] = None
-        self._existing_transactions_loaded = False
 
         logger.info(
             f"TransactionBuilder initialized for {team.abbrev} by user {user_id}"
@@ -233,11 +232,12 @@ class TransactionBuilder:
         """
         Load pre-existing transactions for next week.
 
+        Always re-fetches from the API to capture transactions submitted
+        by other users or sessions since the builder was initialized.
+
         Queries for all organizational affiliates (ML, MiL, IL) to ensure
         trades involving affiliate teams are included in roster projections.
         """
-        if self._existing_transactions_loaded:
-            return
 
         try:
             # Include all org affiliates so trades involving MiL/IL teams are captured
@@ -252,14 +252,12 @@ class TransactionBuilder:
                     week_start=next_week,
                 )
             )
-            self._existing_transactions_loaded = True
             logger.debug(
                 f"Loaded {len(self._existing_transactions or [])} existing transactions for {self.team.abbrev} org ({org_abbrevs}) week {next_week}"
             )
         except Exception as e:
             logger.error(f"Failed to load existing transactions: {e}")
             self._existing_transactions = []
-            self._existing_transactions_loaded = True
 
     async def add_move(
         self,