diff --git a/components/Pages/PageOptions.tsx b/components/Pages/PageOptions.tsx
index df608f46..561d1cf0 100644
--- a/components/Pages/PageOptions.tsx
+++ b/components/Pages/PageOptions.tsx
@@ -93,7 +93,7 @@ export const UndoButtons = () => {
 
           <PageOptionButton
             secondary
-            onClick={() => undoManager.undo()}
+            onClick={() => undoManager.redo()}
             disabled={!undoState.canRedo}
           >
             <RedoTiny />
diff --git a/src/replicache/clientMutationContext.ts b/src/replicache/clientMutationContext.ts
index d6c1584f..edc87fed 100644
--- a/src/replicache/clientMutationContext.ts
+++ b/src/replicache/clientMutationContext.ts
@@ -67,6 +67,13 @@ export function clientMutationContext(
             textData.value = base64.fromByteArray(updateBytes);
           }
         }
+      } else if (f.id) {
+        // For cardinality "many" with an explicit ID, fetch the existing fact
+        // so undo can restore it instead of deleting
+        let fact = await tx.get(f.id);
+        if (fact) {
+          existingFact = [fact as Fact<any>];
+        }
       }
       if (!ignoreUndo)
         undoManager.add({