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The root cause is simple: For a font to display correctly, that specific file must be installed on the operating system of the device viewing it. Common reasons for the mismatch include:

Different fonts have different widths. A substitute font might be slightly wider, pushing your text onto a new page or causing it to overlap with images.

It’s tempting to just hit "Continue" and get to work, but font substitution isn't just about aesthetics. It can cause functional errors:

You created a file on a Mac using a Mac-specific font (like Apple Chancery ) and opened it on a Windows PC.

Bullet points, special characters, and mathematical symbols are often tied to specific font sets. Substitution can turn these into unreadable squares (tofus) or question marks.

The designer used a professional, paid font that isn't part of the standard Windows or macOS library.

An older version of Office might use fonts that are no longer "standard" in the newest subscription models. The Risks of Clicking "Continue"

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