did you add additional font weights after initially adding the font?
Try delete the font in the project settings completely (both weights) and add it again, but make sure you are adding both font weights at once.
Eventually, you should have one entry for your font with all font weights in it.
Don’t worry about having to apply the fonts to your text elements again. As soon as you readd the font, elements you have set the font for are going to have it applied.
I wasn’t able to fix this. I read on another thread that the default fonts cannot have other weights applied than the ones initially included by Webflow. Sorry
In the end, I just chose another font.
I got around this by renaming the Inconsolata files as something else. When uploaded, you have a font available that has this custom name, and that renders all the Inconsolata weights.