That is super weird! How did you create the SVG? If you used an online png → svg tool it may have created a “fake” one where it simply wrapped a PNG inside of the SVG.
The SVG was created in Adobe Illustrator. I just deleted the SVG from the asset panel entirely, and used the PNG. Nothing resolved as it still looks the same when I re-published the site.
I see that as well on my site, however, with an SVG generated out of sketch. I’m using proxima nova on this page, https://www.quantifind.com/products-signum-reach and the charts are in proxima nova, which show fine as long as the device is a desktop, tablets and iPhones, the fonts switch to times new roman.