I suspect this bug is different from this Linux only bug:
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I’m using Firefox on Windows 8 and have the same issue
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The offset is much greater:
in the same line but with missing padding
more or less in the next line vs.
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It’s happening only in the search box for topics and not in the otherwise pretty similar styled general search box
So while still being unique to Firefox (it’s not happening in Chrome or Edge) it also appears to be unique to the topic search box, so this might indicate that it’s also a discourse issue and not only a browser issue.