A customer who has downloaded a whitepaper from via a form submission on one of our Marketo landing pages has received multiple trigger emails, and has continued to do so ever since that first form submission.
Looking at the activity log there are intermittent multiple form submissions (which are triggering the confirmation email send - not shown in image below, I've suspended customer's email address while investigating).
Seems that the form submission appears to be stuck in some kind of a loop.
Anyone experienced this behaviour before and any clue as to the possible cause?
Looks to be an isolated case. Landing page is same set-up as usual and haven't seen any other such incidents.