Blogger comment box doesn't work on mobile devices

Hi guys,

I'm having trouble with readers being able to submit Idea on my blog. If they send a comment from a PC/Mac, it goes through, but if they try from a mobile device or tablet the comment box just doesn't work (it shows up but it's not clickable).

How can I fix this? I've tried everything (from different platforms, with and without Google login) but it doesn't seem to work. The template designer isn't available to fix the problem right now so I have to fix it myself.

Yhanks!