The Left and Right Spaces feature of Swiss Army Block’s Outer Space is not compatible with Headway 3.5 when multiple wrappers are used.

Currently, those spaces will appear next to every wrapper.

I have been advised a fix is forthcoming and when it does, I will make Left and Right spaces work with it by providing an option to choose the wrappers for them to appear with.

Until then, you should only use the Left and Right spaces on sites with single wrappers.