Hi @Alfie_Coleman ,
Welcome to the forum!
I’ve moved this topic to Tips and Tricks as it it isn’t feedback for changing/adding functionality, but rather troubleshooting existing fuctionality.
That sounds like it is a bug. What happens when you delete the rule and make a new one?
To get help with this I’d advise to contact support, but they are quite busy so it may take more than a week for them to respond.