I have encountered a problem with rendering a book in the gitbook format (bookdown::render_book('file.Rmd')). What happens is that the final HTML is looking fine down to "Section 4" (in my example below). This section is not indented/aligned with the other text but rather starts directly to the right of the sidebar, without any margins. I don't understand why it happens at Section 4 and not also Section 2.

If I add echo=FALSE to the last code chunk, this problem goes away.

I have played around with countless modifications of the file below trying to figure out what is causing this but failed to understand. I suspect that it is div tags that are not created correctly, judging by looking at the resulting html files.

A final note is that this was done with bookdown version 0.11, and it seems like the issue is also in 0.10. I downgraded to 0.7 and that resolved the problem.

file.Rmd:

---
title: "Title"
---

# Title

test

## Section 1

test
```{r}
1+1
```

## Section 2

test

## Section 3

test
```{r}
2+2
```

## Section 4

test

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