diff --git a/src/transactions/add-transaction-dialog.jsx b/src/transactions/add-transaction-dialog.jsx
index 3c40f90..1cf4e93 100644
--- a/src/transactions/add-transaction-dialog.jsx
+++ b/src/transactions/add-transaction-dialog.jsx
@@ -111,10 +111,11 @@ const AddTransactionDialog = ({
             ...Object.fromEntries(new FormData(event.target).entries()),
         };
 
-        const parts = tx.category.split(':');
-        tx.category = parts.shift().trim();
-        tx.subCategory = parts.join(':').trim() || tx.category;
-
+        if (tx.category) {
+            const parts = tx.category.split(':');
+            tx.category = parts.shift().trim();
+            tx.subCategory = parts.join(':').trim() || tx.category;
+        }
         if (tx.remarks) {
             tx.remarks = tx.remarks.trim();
         }
@@ -144,7 +145,13 @@ const AddTransactionDialog = ({
         const endpoint = transactionToEdit ? editTransaction : addTransaction;
 
         const postProcess = (response, tx) => {
-            setTransactions(tx);
+            const processedTx = tx.map((o) => {
+                const category = o.category && o.category.indexOf(':') === -1 && o.subCategory && o.subCategory !== o.category
+                    ? `${o.category}: ${o.subCategory}`
+                    : o.category;
+                return { ...o, category };
+            });
+            setTransactions(processedTx);
             setSelectedRows(response.map(({ id }) => id));
             setShowAddDialog(false);
             showStatus('success', 'Transaction ' + (transactionToEdit ? 'edited' : 'added'));
@@ -230,13 +237,13 @@ const AddTransactionDialog = ({
         onInput: (e) => e.target.value = restrictFormat(e.target.value, true),
     };
 
-    const lookupCategory = (e, value) => {
+    const lookupCategory = (_, value) => {
         if (!value) {
             return;
         }
         const match = transactions.find((t) => t.remarks === value);
         if (match) {
-            setCategory(match.subCategory ? `${match.category}: ${match.subCategory}` : match.category);
+            setCategory(match.category);
         }
     };
 
diff --git a/src/transactions/bulk-transaction-dialog.jsx b/src/transactions/bulk-transaction-dialog.jsx
index f3cd978..88b9a75 100644
--- a/src/transactions/bulk-transaction-dialog.jsx
+++ b/src/transactions/bulk-transaction-dialog.jsx
@@ -72,11 +72,16 @@ const BulkTransactionDialog = ({
         }
         setLoading(true);
         bulkEditTransactions(values, () => {
+            const category = values.category && values.category.indexOf(':') === -1
+                    && values.subCategory && values.subCategory !== values.category
+                ? `${values.category}: ${values.subCategory}`
+                : values.category;
+
             const revised = [ ...transactions ].map((t) =>
                 (transactionToEdit.indexOf(t.id) === -1) ? t : ({
                     ...t,
                     billingMonth: values.billingMonth || t.billingMonth,
-                    category: values.category || t.category,
+                    category: category || t.category,
                     subCategory: values.subCategory || t.subCategory,
                     remarks: values.remarks || t.remarks,
                 })