Hoping someone (or Klaviyo staff) can help with a strange one.
One email in a Draft flow delivers with its entire body duplicated — logo → hero → copy → product → footer, then the whole thing again. It happens on every test send ("Preview email → Send as an email"), viewed in Gmail.
But the template is a single, clean HTML document by every measure I can check:
- The HTML code editor shows one
<!DOCTYPE>, one<body>, one of each element. GET /api/templates/{id}returns a single clean document.POST /api/template-render(render API) returns a single clean email.- The in-app Preview (editor + content page) renders a single email.
Two sibling emails in the same flow, built with structurally identical templates, deliver correctly as a single email.
Things I've tried — all still deliver doubled:
- Removed a pre-existing duplicate
<!DOCTYPE>/<head>and saved a clean single document. - Switched the message template type Text → HTML and re-pasted clean HTML (fresh template blob).
- Created a brand-new message in the flow with a fresh HTML template + clean content.
It looks like a cached/compiled send-version is held at the message level that isn't refreshed by editing the template, switching type, or even creating a new message. It's an HTML (code) template on an Added-to-List flow.
Q: Why would a single clean template (confirmed via the render API) deliver with its body duplicated for one specific message, while identical sibling messages deliver fine — and how do I clear/rebuild that compiled version? Happy to share message/template IDs privately.