I just answered my own question, and am now viewing answer 1 of 0 - doesn't seem right!
Note this is both in the title bar, and the big bold "0 answers" line - unfortunately I can't add red freehand circles on the app...
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I actually found this a little while back; this bug has been fixed in beta version 220.127.116.11, and the fix will be available in the next Appstore update.
The issue had to do with how we keep track of the answers in the app – the rendered answers are stored separately from the answers we retrieve from the API. When a new answer was added, we would append it to the rendered ones. However, the logic that calculates "answer x of y" and "x answers" was still referring to the API answers, which were out of date. This has been rectified.