iOS: Highlighted region doesn't match selected text

I've noticed in several PDFs that the highlighted text doesn't always match the selection. In other words, after selecting some text and clicking highlight, the region that is highlighted is not the same as what was selected.

Here's a video illustrating this:

https://drive.google.com/file/d/1SBs05lGwTDzS1g9hQPV4fVaFww5YIGD4/view?usp=sharing

Is this a problem with the PDF file, or an issue with zotero?
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