Hi - In the future, kindly do not post inside someone else's post unless you are attempting to help that person. The post you posted in is over two years old.
That said, I took a quick look at the issue you reported. Some font sizes may be overridden by others elsewhere in the CSS or JS. You may have to manually tweak font sizes in a specific area to achieve the desired results.
I am going to close this thread, so if you have additional questions, kindly open a new one. Cheers!