What browser does this issue occur on? All of them, or one or two specifically? Some browsers have problems with bolding when specifying a number (font-weight:200) instead of using the other method: lighter, bold, bolder, etc. Can you post the HTML/CSS? I want to see how you call/reference the font name. There are a few ways that this can be done.
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In my sites I give each font a unique 'Font-Family' name; when I want bold, I'd call 'ProximaNova-Bold' so I know I'm calling the right one. – Sep 16 '15 at 23:11 •.
The Proxima Nova family is a complete reworking of Proxima Sans (1994). The original six fonts (three weights with italics) have been expanded to 48 full-featured OpenType fonts. There are three widths: Proxima Nova, Proxima Nova Condensed, and Proxima Nova Extra Condensed. Each width consists of 16 fonts—eight weights with matching italics. Stylistically, Proxima Nova straddles the gap between typefaces like Futura and Akzidenz Grotesk. The result is a hybrid combining humanistic proportions with a somewhat geometric appearance. Feature Summary: 8 weights: Thin, Light, Regular, Medium, Semibold, Bold, Extrabold, and Black 3 widths: Normal, Condensed, and Extra Condensed Matching italics for all weights and widths Matching small caps for all weights and widths*.