It's an easy problem that is easy to fix. If you enclose a section of text with a set of single quotes (appears like '' but is ' entered twice) on each side of the text, it will put the text in italics; more than the two ' makes it bold. If you click the italics icon, it will insert the "insert text", however because that was next to something already in italics it made the following text bold instead of italics.
Hopefully it's now fixed for you.