I know it sounds weird, but it actually happens on my end.

I copied one overleaf project (created several month before) to a new one, so the content should be exactly same.

I compiled those two documents, it returned with pdf with slight variations.

For the old project, this is the end of first line and second line of title, enter image description here

For the newly copied project, word "communities" went to the second line.

For other parts, this situation happens a few times.

What might be the cause? I diff-check all tex files and format files in those two projects, and it is exactly the same.

Really confused.

  • 3
    it may be possible that some packages have updated. also check that you are using the same TeX engine.
    – plante
    Commented Nov 4, 2021 at 5:20
  • @plante, thanks, problem solved now. Overleaf defaults my newly copied project to the 2021 tex engine, while my old one is using the 2020 tex engine.
    Commented Nov 4, 2021 at 14:51

1 Answer 1


Similar to the comment from user plante: Make sure that you use the same TeX Live Version and Compiler, see screenshots.

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