Font size incorrect in email signature.

When I create a new email in Outlook on my Windows 7 PC, the email signature is a different size font from the email text font, even though I set them up as the same size in settings.  A week ago, when messing with the settings, it would not even let me set the font I wanted in the signature.  Today it does, but the size is still not working.  Sometimes, and this is really screwball, the font sizes 10 and 12 display the same size in the signature settings.  Right now, I have the sizes the same between the text and signature in the settings page, but when I open a new email, the signature is once again too small compared to the text.  This is very aggravating and makes my emails look non-professional.  What contortions do I have to go through to make the fonts display at the proper size in my emails?