Are you sure it is not triggering the notify or just that it is not doing damage? In the included offensive ability blueprints I unbind the event dispatcher which listens for the attack hitting after the first hit, so this is what might be happening. If you are uncertain about what is being triggered, try using PrintString nodes to see how many times something is executed (like the notify events) or use breakpoints.
Ok, I see. The toolkit is made for turn-based games, so if you want to make a real-time game it is probably not a good fit. Everything from abilities to how actions are animated is designed with turn-based gameplay in mind. There are features that can be useful even for real-time games, such as my implementation for storing and accessing data from grids etc., but you would need to scrap most stuff and build a lot of things from scratch. If you got the incorrect impression when you bought the toolkit you can consider asking Epic for a refund.