Why some footnotes lines are slim and others are bold?

edited August 15, 2021
Ubuntu 18.04.5 LTS
Libre Office 6.0.3.2
Zotero 5.0.89

https://ibb.co/GMDmp7Z
https://ibb.co/M1J8WhJ

Today I have noticed that footnote lines in my document (100 pages) are on some pages slim and or other pages bold. I reckon that this has nothing to do neither with even/odd page variation nor with number of footnotes. It goes like this: 2xB, 9xS, 3xB, 1xS, 1xB, 2xS, 2xB, 8xS, 2xB, 4xS, 1xB, 7xS, 1xB, 8xS, 1xB, 1xS, 1xB, 6xS, 1xB, 1xS, 1xB, 1xS, 4xB, 1xS, 2xB, 1xS, 1xB, 1xS, 1xB. The footnote lines have identical length but various thickness. I use Zotero footnotes only so there is no Libre Office note (Insert --> Footnote/Endnote). I have no experience in DTP and therefore I do not know if it the way it should be. I would prefer to have only one kind of footnote lines - either slim or bold.

Thank you for your help in advance and wish you all good health!
QB

EDITED: The differences are preserved when exported to PDF. It is not a display issue.

EDITED2: Printing it to PDF only changes the pattern to: 5xB, 1xS, 6xB, 1xS, 15xB, 2xS, 4xB, 1xS, 7xB, 1xS, 8xB, 1xS, 2xB, 2xS, 3xB, 1xS, 13xB, 1xS, 1xB (source: https://www.reddit.com/r/libreoffice/comments/mndn76/psa_if_the_lines_over_your_footnotes_have_a/).
  • That would be a question for LibreOffice. There's no such thing as "Zotero footnotes" — they're a feature of the word processor.

    The first think you would likely need to do is upgrade to a current version of LibreOffice 7.1, though. You're on a very old version, and I wouldn't expect anyone to provide support for that.
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