2) Changing the fonts in the TYPOGRAPHY have no effect UNLESS you fill in the color and font-size also. So you just can’t change the font otherwise your font setting will not take effect. you are forced to put a font-size and color.
Please deactivate all the plugins not related to the theme and switch the parent theme, check the issue, If the problem has gone, activate the plugins one by one, checking the issue to detect which one causes the problem.
if the problem remains, even after the plugins deactivated leave the plugins deactivated, remove all the custom CSS for us to check, and provide your site admin access to the private area.
we’ve all done that. this is an active project right now so we can’t be messing around at the moment. I’m just reporting it if you want to do some testing on your end. or see if others have reported it.