The way a Google Docs document displays in Brave is different from how it displays elsewhere (another browser, word processor, pdf) - the character spacing is off which causes the text to reflow and messes up the document formatting. In the image you can see it would only take one more word for there to be an additional line the way Brave displays and prints the document. In this particular multi-page document, Brave changed the formatting enough that an another page was added.
The document displays differently in Chromium and almost exactly matches the appearance of a downloaded docx and pdf. If you do a “round trip”, upload a docx and view it in Google Docs and then download as a docx from Google Docs, the original docx and the downloaded docx match. The problem is with how Brave manages the document in Google Docs. The font in use is Comic Sans MS.
I expect that how the browser displays the document should match other formats of the document (docx, odt, rtf, pdf), at least closely enough to avoid obvious reformatting.
Brave Version 1.22.70 Chromium: 89.0.4389.105 (Official Build) (64-bit)
Chromium Version 89.0.4389.90 (openSUSE Build) (64-bit)