If you look at your blog post after it is published, and the text is just too small, we've found that 99% of the time the reason is the font, specifically "Calibri".  This means that you copied and pasted from Word, and it pulled in the font.  The problem is that web browsers treat the Calibri font differently than Word does, with it being much smaller when published.  So this is my suggestion:  When you post a new blog, rather than pasting your blog directly into the text box, click on the icon that has the small blue "W" on it.  This will allow you to paste from Word easily with a "cleaner" end product!  If you have any questions, just let me know!