1 execution recorded with 1 item on the entire flow however duplicates output on nodes salesforce & slack

Help me Build my Workflow
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Hello there !

I’ve been coping with an issue on 1 of my flow, which was working correctly 5 days ago.

My flow starts with a webhook triggered by Jimo whenever a click is logged on a pop-up within our app. Logs are corrects, and it runs 1 execution on my N8N flow.

However, even though I get only a single execution in N8N and 1 log on Jimo side and only 1 single item during the entire N8N flow running >>>> I now end up with duplicates on my SalesForce and Slack nodes (so 2 custom objects created in SalesForce and 2 Slack message sent).

I tried adding limits nodes > it didn’t work
I tried cloning and deleting the orginal flow + changing the webhook set up > it didn’t work
I tried changing response settings on my webhook > it didn’t work (now it’s on “Respond immediately”

We recently passed on self hosting > can it be a reason ?
But how come I cannot see an execution eventhough there are duplicates outputs but without seeing 2 items in the nodes outputs ?

Can you help me please ?

FYI @Bastien_Gouraud

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If you create a new workflow on the same instance and add Webhook node and slack node and test it same as your real workflow. if you receive a single message, which probably will happen, share your workflow.

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FYI it was a multi-workers server problem related to the migration from N8N cloud server to internal one.
That’s why it was only affecting specific flows with webhook + wait.

RELATED TOPIC > Ghost sub-executions: duplicated runs while parent execution shows single calls

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This usually points to a webhook retry or replay issue after switching to self-hosting. Even with one execution shown in n8n, the source or proxy can trigger the request twice, causing duplicate outputs.

I’ve helped fix similar cases before…..happy to help you look into it. If you’d like, let’s connect and review the setup together.