Usually such problems occur when the browser cannot correctly determine the characteristics of the used font or substitutes the font with another one. As a suggestion I can suggest to try changing the font or its size and also provide more information about the used device, browser and OS so we can test it on our side.
I assume the screenshot is from the HTML5 viewer whose responsive layout supports mobile mode. Please check if the same report on desktop behaves the same way when the viewer is in mobile mode. To test that, resize and shrink the browser window until the toolbar changes its layout and the compact menu appears (refer to the attached screenshot).
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