Found a solution which worked. I'm not really sure why it worked but it did.
A couple times up above I call a partial to render the text area and form where the user can edit their review, like this
<%= render :partial => "reviews/text_area" %>
All I had to do was go in and edit this partial. One of lines in the form looked like this:
<%= f.text_area :review %>
All I did was change it to this:
<textarea cols="40" id="rating_review" name="rating[review]" rows="20"><%=@user_rating.review%></textarea>
Basically just put it in manually so it didn't use the rails function to generate the text area. For whatever reason, it works now. May be something that could be improved in the rails text_area function.