Formatting in a CTA

Formatting in a CTA description field consistently gives me issues with formatting. I open a new CTA - go to the description field - attempt to add text and it doesn't allow me the opportunity to type...at all...I have no idea why. I close the CTA and go back in - same experience.

It doesn't allow me to copy and paste text in either. 

This happens randomly and I don't understand what causes it. I can show you firsthand and also have a screenshot of what it looks like when I FINALLY can add text - you can see it cuts it off. Frustrating :(