Vertical spacing between blocks

It looks like everything in “RTS diagnosis” and below are in a WordPress “Group” block. The Group block is adding 4em of padding on the top and bottom:

.wp-block-group {
    padding-top: 4em;
    padding-bottom:4em
}

You can either remove the accordion items from the group (so they are all at the same level), or adjust your styles to remove the padding from groups (be careful if you do this, it may impact other areas of the site).

Thank you – space is now gone!
One last question – and I’m sorry if I’m missing the obvious but Is RTS hereditory has nested itself in Why does RTS happen but I’d like it as a seperate Q/A – how to unest?

The easiest way to un-nest an accordion is to use the built in drag and drop functionality of Gutenberg. When you have an accordion block selected, in the toolbar you’ll see an icon with 6 dots. You can click and drag the 6 dots icon to move the block. Simply drag it out of the other accordion item content, and drop it somewhere at the top level of your content.