Does this happen for all workflows or just a few of them? Can you also try updating n8n to see if that helps, I think we fixed an issue around this recently.
@Jon
It happens for all workflows which were not triggered manually. Manual executions can be stopped, but it takes some time until they actually are. I will try updating and let you know.
Can you share your workflows are you doing and how you have n8n configured as I am not able to reproduce this and I would expect to see more reports of an issue like this.