ConvertKit’s visual automation builder lets you create subscriber journeys triggered by tags, form submissions, product purchases, and other events. It’s more flexible than the older rule-based sequences—but that flexibility introduces a subtle bug that can send duplicate emails to the same subscriber.
If a subscriber meets more than one entry condition at the same time, they can enter the same automation twice. The platform doesn’t deduplicate entries by default, so a single action can spawn two parallel runs of the same workflow.
How the overlap happens
Visual automations accept multiple triggers. You might configure an automation to start when a subscriber gets tagged “Lead Magnet A” or when they submit a specific form. If someone submits that form and your form settings apply the tag automatically, both triggers fire.
ConvertKit processes each trigger independently. The subscriber enters once via the form trigger, and again via the tag trigger. If your automation sends a welcome email as step one, they receive two copies within seconds of each other.
This also happens when you use Zapier or API calls to apply tags. If your Zap adds a tag and triggers a webhook that also starts the automation, you’ve created two entry points for the same event.
Where it breaks workflows
Duplicate entries don’t just mean duplicate emails. If your automation includes conditional splits, each instance of the subscriber moves through independently. A subscriber in two parallel runs can trigger different paths based on timing—one instance might hit a delay while the other checks a condition immediately.
This gets worse in automations with wait steps. A subscriber paused for three days in one run might complete a purchase during that window, which your second parallel run detects immediately. Now they’re receiving emails from two conflicting sequences: one treating them as a lead, the other as a customer.
ConvertKit’s reporting doesn’t surface this clearly. The automation analytics show total entries and completions, but don’t flag when the same email address enters multiple times. You’ll see inflated entry counts without realizing some subscribers are being double-processed.
How to prevent it
The safest fix is to use a single trigger per automation. If you need multiple entry points, create separate automations for each and funnel subscribers into a shared tag-based sequence after the initial step.
Alternatively, add a filter at the start of your automation that checks for an exclusion tag. The first action in your workflow applies a tag like “Automation-Started-Welcome-Series,” and the entry conditions exclude anyone who already has that tag. This blocks the second parallel run before it sends anything.
You can also audit your form settings and Zapier workflows. If a form already triggers an automation, don’t also apply a tag that serves as a separate trigger for the same workflow. Pick one mechanism and stick with it.
For API users, check whether your webhook handler and tag application both fire automations. If you’re using ConvertKit’s subscriber tagging endpoint, make sure your webhook doesn’t also trigger on that tag event unless you’ve built in deduplication logic on your end.
What ConvertKit could do
Other platforms like ActiveCampaign and Drip deduplicate automation entries by default. If a contact is already active in an automation, a second trigger either gets ignored or restarts the sequence from the beginning—your choice via a setting.
ConvertKit doesn’t offer this. The visual builder treats each trigger as independent, with no native deduplication toggle. You can request it via their feature feedback form, but as of September 2026, it’s not on the public roadmap.
Until then, the workaround is manual: simplify your triggers, use exclusion tags, and test every automation with a real subscriber before turning it on for your full list.
Have you hit this issue in ConvertKit or another platform? Reply and let me know how you solved it—I’ll share the best workarounds in a follow-up.