I have started using sub-flows and it is great.
My understanding is that I have a flow and because parts of it are repeated, rather than have the same nodes repeated, I can use a sub-flow and it acts like a "sub-routine" (from basic).
Yeah, as many of you may know: I'm not the best coder, and I have changed a couple of things in the sub-flow as I have found problems with their working/s.
To edit them I understand I can either double click on the icon and then "edit sub-flow" or double click on it from the left window.
Alas now I have 6 versions in the list.
I get that I am using multiple occurrences of them, but that's the whole idea - isn't it?
What have I done "wrong"?