So i'm on a vpn and maybe that's why- but write the comment, and hit send. it says one needs to do the verification, fine, so it has a back link. After hitting the back link, one sees a blank comment area, the text is gone. I can get the text back by hitting the browser back button twice, interestingly enough.
Sometimes it does the same thing if I forget to enter an image. When I hit the link it gives to go back, the text is blanked out, but if I hit the browser back arrow twice it brings back the text of the comment.
It may just be the vpn that I use causing this effect. Sometime maybe you can see if you can recreate the possible bug? Sometimes the back button works and the comment is still there, sometimes after one sees the error message that says one forgot to send an image or do the captcha, the comment text is gone