Are you recording in Demonstration or Simulation mode? I believe Demonstration mode provides Typing Text. Simulation should provide Text Entry Box. You may need to configure Custom mode before recording.
Sometimes I have the same issue in CP4, even in Simulation Mode. I do not know if this is a bug, because it is not always happening. As a workaround I hide the Typing Text on the Timeline and create my proper TEB.
If you can spare the time, you might want to report this issue to the Adobe Captivate team using link I have incuded below.
Best - Mark