Why does my text become blurry when I play a video and how to fix?

Hi, 

I have been using Adobe Premiere Pro for about a week now and Rush for a month. I just made the switch to Pro and I notice there is a problem that jumped between both platforms. When I add text to my timeline from both platforms whether that is from the free Adobe templates of if I type my own text; the text is smooth and readible. When I start playing my video, all of a sudden the text becomes jagged and if the text is small enough, it becomes blurry and hard to read. 

I was wondering why this is happening and how I could fix this.

Thank you.