As you can see below, the Texta-Light font in Chrome appears completely different with Safari. Chrome displays the font as I like but Safari\'s rendering on OS X and iOS loo
If, as per your comment, you are only serving .otf, you will need to serve the other file types too.
This could be causing an issue to do with iOs as until iOs 4.2, SVG was the only format to use custom fonts on the ipad or iphone.
@font-face {
font-family: 'MyWebFont';
src: url('webfont.eot'); /* IE9 Compat Modes */
src: url('webfont.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
url('webfont.woff2') format('woff2'), /* Super Modern Browsers */
url('webfont.woff') format('woff'), /* Pretty Modern Browsers */
url('webfont.ttf') format('truetype'), /* Safari, Android, iOS */
url('webfont.svg#svgFontName') format('svg'); /* Legacy iOS */
}
A great tool to use is Font Squirrel's Webfont Generator
Edit:
Also as mentioned in the comments the font-weight is set to bold by default and you are loading a light font.