Select all, select the font and size you think is correct, it very well could be you
changed something along the way. Some times when you insert a symbol or a special
character of a different size of the rest of the text, the following text will take
on a different point size. Look at the format of the text box, what is the line
spacing?
Create a dummy text box in the scratch area, paste some text into the box the way you
want your original text to appear, select all in the new box, click the paint brush
format tool, click your original text box.