Header Media Text Font

Hello. In Header Panel section there is an option to customize a Header Text. I have tried to change the font of this text in Accent Color and Body Font section and the following thing happens: the font changes when the Customize menue is opened, I press Publish, exit the Customize and the changes do not save. I have done it multiple times already, also installed Google fonts plugin, thought, maybe that could work, but it didnt help. Could you please assist me on that.

Thank you