Just checked again my structured data report on https://www.google.com/webmasters/tools/structured-data?hl=en
As you can see the Items count for Question is 0 (!)
Also the QAPage counts 0.
Maybe we have a wrong tag here?
You need to check your theme against qa-theme-base.php. You've most likely overridden some functions where the parent function has now changed. For example the html() method now adds tags from $this->content['html_tags']
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Jan 12, 2019: Q2A 1.8.3 released!