I'm sorry others are having the same problem. I reckoned I would be able to create a whole new listing & copy everything over, but that would be quite cumbersome. I'll take the suggestion that was given - also quite cumbersome on some items - but I hope they don't think that it's a satisfactory situation that we do this from now on. Obviously a glitch on their end which should be fixed.

I don't have any variation items to list now for at least a few days so I'll have to wait til then to give it a go.

Thanks to those who looked into it & came back here. Hopefully I won't have to come back too soon lol.