Why are these @defthing blocks typeset incorrectly?

I attached an image showing the rendered output of https://github.com/zyrolasting/xiden/blob/master/docs/reference/settings.scrbl#L48

I create an application to `(defthing)` as a datum due to circumstances in the surrounding code. The hacky part being `get-contract-datum`, which tries to produce a datum usable as a contract expression. I'm assuming that this leaves no whitespace to preserve, so how do I modify a syntax object to include space in desired spots?

~slg

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