Your local("Calibri") repeated twice in the src property.
Also, keep in mind that IE does not support local() , so if you browse your site in IE, it does not load the font. In addition, IE, as far as I know, supports only the EOT format.
For the OTF font, use format("opentype") (you have "truetype").
One more thing: if it's a Microsoft Calibri font, keep in mind that a license cannot permit this type of use. I am not familiar with the license, so I canβt say for sure if this is so.
Jeff source share