Some times changes made to fonts does not display exactly the same when viewing the content.
Changes made to fonts in the backend are translated and controlled by html codes. Each browser (i.e. Chrome, Firefox, IE, Safari, etc) do not read and execute html codes the same way. Some browsers support and are compatible with certain html codes and some does not. This is why some times fonts can be different when viewing on separate browsers. This is something that we cannot control on our end. Our Professional Services team can help customize your email or website content if needed. This is a billable service.