Probably related to the fact that one can operate unpurchased turrets at the end of upgrading time as I described [url=https://www.bungie.net/en/Forums/Post/264476202?sort=0&page=0&path=1]here[/url].
Sometimes for whatever reason after upgrading time runs out unpurchased Operable Turrets do not disappear and remains on the battlefield. They can be operated and behaves as level 1 Operable Turrets. However, after the next upgrading time in the same area the unpurchased Operable Turrets would properly vanish.
In the attached clip I find an unpurchased Operable Turret in a different area. Later in the clip, after upgrading time has run out that turret is still present. I joined that run in progress, so I assume the turret appeared after 7th wave (or 17th, 27th, 37th) and then ADU never appeared in its area.
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Hello Prometheus, Thank you very much for the detailed report and the video. Similar to your other report, we've taken note of this report and will continue investigating any underlying issues that may be occurring from our end. For any updates on this issue, we recommend viewing our Patch Notes as they become available, posted on the [url=https://www.bungie.net/7/en/News]News[/url] page.