Configuration:
* Web browser and its version: The latest
* Operating system and its version: The latest
* PDF.js version: The latest
* Is a browser extension: Yes

None of this is useful, since "the latest" doesn't mean anything; you need to actually fill out this section properly with actual names and version numbers explicitly specified.

The page number in the input box is incorrect.

That's most definitely correct, see https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#G11.1696265. (And if that were a bug, which it clearly isn't, you should always report one problem per issue.)

Thanks, updated.

Instead of creating another issue, I'll just add a comment with a second example and some more details. I tried on two different machines and 5 different browsers, all with the same results. I initially noticed this developing the pdf viewer on my own site but I was able to repro it using the version that is deployed at https://mozilla.github.io/pdf.js/web/viewer.html.

Repro:

1. Use the attached PDF or download from https://pdfobject.com/pdf/pdf_open_parameters_acro8.pdf
2. Visit https://mozilla.github.io/pdf.js/web/viewer.html
3. Open the downloaded PDF from above.
4. Use the find function to search for "this guide". The example here is the 7th match.

Operating system: Windows 10 22H2 19045.3448 and MacOS 13.6 (22G120)
Browser: Edge 117.0.2045.36 (Windows), Chrome 117.0.5938.92 (Both), Firefox 117.0.1 (Mac), Safari 16.6 (18615.3.12.11.2) (Mac)
Library version: 3.10.111
Is browser extension: no

pdf_open_parameters_acro8.pdf

Someone pointed out to me that this library is what is actually used as the built-in/native viewer in Firefox. So I tried opening the link to the PDF above directly in FF and it also shows the same misalignment problem. The Chrome viewer for comparison does not.