This bug is related to the use of AFT on meta to rate translations.
We've seen average ratings of less than 1, meaning that if someone submits ratings for 1 or 2 categories and leaves the 3rd category empty (ie 0 stars), the 0-star rating still appears to be counted into the average.
Per Howie, this was fixed before, but seems to have appeared again, at least in the version we're using on meta.
Version: unspecified
Severity: minor
Whiteboard: wikimedia[unmaintained]
The extension homepage at [[mw:Extension:ArticleFeedback]] says
"This extension has been archived. This extension has not been maintained in some time, and no longer supports recent releases of MediaWiki.
The following other choices are still available: [[mw:Extension:ArticleFeedbackv5]]"
Furthermore, ArticleFeedback (version 4 or earlier) was removed from all Wikimedia wikis in https://gerrit.wikimedia.org/r/#/c/98074/
It is currently unlikely that there will be any further active development of ArticleFeedback (version 4 or earlier).
Closing this report as WONTFIX to reflect reality.
Please feel free to reopen this report in the future if anyone takes the responsibility for active development of ArticleFeedback (version 4 or earlier) again.
Thank you for reporting this bug and we are sorry it could not be fixed.