Hi @Mark McDonald - I took a look into this and can't replicate but have some ideas so wondered if you'd mind answering some follow up questions:
1. Are you still seeing this?
2. Are you seeing this on all flows or just the one you shared?
3. For the flow you shared it looks like there a lot of flow versions. (You can see that from the drop down on the flow page next to the quick run button). If you delete some of oldest versions does it fix the issue? If you don't want to delete older versions would you like us to try that for you?