#399

frontend/src/components/posts/import/PostImportRowForm.tsx

@@ -52,7 +52,7 @@ const buildResetDraft = (row: PostImportRow): Draft => ({
     parentPostIds: String (row.resetSnapshot.attributes.parentPostIds ?? '') })
 
 const groupedMessages = (...values: (string[] | undefined)[]): string[] =>
-    values.flatMap (value => value ?? [])
+    [...new Set (values.flatMap (value => value ?? []))]
 
 const sameDraft = (left:  Draft, right: Draft): boolean =>
     left.url === right.url