Hey
@OllieG
As we can see from your workflow, you are getting the same trigger response multiple times and because of that, your tasks are getting executed multiple times.
And the reason behind that is perhaps you have pressed the "Save & Send Request" multiple times which has created the webhook URL in your Webflow multiple times.
Example -
The Sample was from Pipedrive but you might have also got the same warning message.
Solution -
1. You can delete the multiple webhooks from your Webflow account as mentioned in the following screenshot if available from the account level or can contact their support team to delete the similar additional webhook URL from your Webflow account.
2. Furthermore, you can create a new workflow/clone the same one and delete the previous one which will create a new webhook only once and can send the data one time.