The issue likely occurs because iOS isn't rendering the "Open-Sans-Bold" font properly. Ensure the font file is correctly linked and provided in web-safe formats like .woff or .woff2. Explicitly set font-weight: bold; for the strong tag and include a fallback font-family, such as sans-serif, in case the primary font fails. Verify the font file is loading correctly in the browser's developer tools, as missing or incompatible files can cause this issue.