Plugin won’t save new sections

Hi,
I’ve been trying out this plugin to create my review posts. Everything worked fine up to the point that it wouldn’t save latest changes. My posts are rather long with a lot of sections. If I modify existing sections(merge them together where possible) I’m left with empty sections I can then use and it will save the changes. But only if the section is not modified(like one column changed to 2 or more).

That’s the work around it but it’s not the point as I wanted to speed up my work. This way is just a waste of my time and I can’t afford it.
Is there any chance that it could be fixed? I’ve tried 3 latest versions of the plugin and it’s all the same.
Thanks
Kasia