I signed up in another forum, Gateworld, just to see if I have the same problems. Yup. It's a display while typing in the text box. The posts display fine otherwise.

I'm going to shut down the computer and restart. If it continues upon restart, I will remove Grammarly. That should do the trick.

Edit: Nope, restarting doesn't help. uninstall is next.

Edit: Okay. Disabling Grammarly extension and restarting Chrome worked.

I really like Grammarly. I'll need to check this out.