Hi @yuriyd6e
This is not Canvas Support, even though some support folks come in here some times. This is a global community of Canvas users just like yourself.
Anyways, I have seen this same thing happen occasionally in the past, and always when content has either been pasted from materials in another tool (like MS Word) that uses a font style that is unsupported by Canvas, or when copying content from a much older version of Canvas that used a now unsupported font. Very rarely is this a Canvas bug.
It sounds like you are a student, so I would let your teacher know about this so that they can fix it.
Kelley
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