PenciDesign replied
Hi,
Ahh, yeah, that's normal because you're using 2 different format.
One for heading and one for list. Of course it get different size.
Please use element Classic - check this image: http://prntscr.com/phjvl1
I've installed help you plugin TinyMCE Advanced to help you can change font size via this Classic element:
Best Regards,
PenciDesign