I keep having to retry it or backspace over the previous letter and retype quickly.
Topic on Talk:Talk pages project/Replying/Flow
Are you having this problem elsewhere? And are you, by any chance, using a relatively recent Mac laptop? I had to have the keyboard on my MacBook Air replaced.
@Whatamidoing (WMF): No, it is a software keyboard on my Puffin Browser Pro (v4.7.3) on my iPad 3. If I type "test " 10 times in a row, the space fails 9 times, even though the keyboard clicks and dims when I press the spacebar as normal. In Google Chrome (v37.0.2062.60) on that iPad, the reply link doesn't even show up. It works fine in Chrome on my Win10 laptop. These tests were all conducted on https://commons.wikimedia.org/wiki/Commons:Deletion_requests/Files_uploaded_by_2mohmmad#Files_uploaded_by_2mohmmad_(talk_·_contribs)_3 , a section I last edited on a page in project space.
In Google Chrome, are you on the mobile website, or the desktop website?
@Whatamidoing (WMF): On my iPad: desktop & mobile; landscape & portrait; logged-in & anonymous. On my laptop: I'll get back to you soon.
Whatever browser you use on an iPad, the internals that render the actual web are always Safari and the iOS. Can you get the version of Safari and the version of iOS you use on that iPad ? And do you have any gadgets and/or user scripts enabled ?
Safari is "Bundle Version 8536.25", but can't establish a secure connection to any WMF site. iOS is 6.1, JB (all attempts to update have failed). On my laptop, the reply link does not show up in mobile view or when logged out, only in desktop view while logged in. Portrait mode is not an option. My gadgets and scripts have nothing to do with my ability to do anonymous editing.
"iOS is 6.1" well there is your problem :D That's not an officially supported device/OS version any longer.