Grist Webhook rows

In the Webhook Settings page (accessed by clicking the Manage Webhook buttons on the document settings page), there are 9 rows. Some of the URLs seem to link to old connections for Pabbly Connect and get an error when clicked on). Can I delete these rows? I have disabled them from the moment We are trying to use Pabbly connect and are getting inconsistent results. I am wondering if these old connections are interfering.

Any help would be greatly appreciate.

Thanks