A friend told me they tried to comment on a blog post but it didn't go through. I noticed that on mobile devices, the comment section fields are not identified. Until I can get an answer from the company, here's what I know from trying it out myself. The top box is for your name, 2nd box is your email address, I didn't use the 3rd box, and the 4th box is for your comment. I sent a comment to myself this way...haha.
I apologize for the confusion on that, and I would love to hear from you!