pjfry

I can confirm this problem on my website too. 

I would recommend submitting a ticket for support. It sounds like whoever may be browsing when the task is triggered might be getting used as the author, instead of whoever you configured to be the author.

I noticed something weird today. I'm importing shortnews from several external sites to a database. The author is set to my account because the fake account I've set up for the import didn't work at all, it always used mine (UserID 1).
https://xboxhub.com/shortnews/xbox-series-x-inoffizielles-unboxing-der-konsole-r119/
Later I noticed other imports had other authors, regular members that can't even create articles in that database at all...
https://xboxhub.com/shortnews/yakuza-like-a-dragon-xbox-series-x-gameplay-videos-veröffentlicht-r125/
https://xboxhub.com/shortnews/xbox-series-x-–-erstes-unboxing-aufgetaucht-r127/
Looks to me like that are the accounts that triggered the task.
When I import feeds to threads instead, it always uses the correct author (the already mentioned fake account).

That is a solution:
in the block template search for:
<span class='ipsType_light ipsType_small'>{lang="widget_member_joined_date" htmlsprintf="$member->joined->html()"}</span> {{if $member->last_activity}} <br><span class='ipsType_light ipsType_small'>{lang="widget_member_last_active_date" htmlsprintf="\IPS\DateTime::ts( $member->last_activity )->html()"}</span> and replace this with:
<span class='mt_Title'><i class="fa fa-birthday-cake" aria-hidden="true"></i> {lang="mt_bday"}:</span> <span class='mt_Content'>{$member->birthday}</span>  
Many thanks to @V0RT3X666 providing me this solution!
Benny

That is a solution:
in the block template search for:
<span class='ipsType_light ipsType_small'>{lang="widget_member_joined_date" htmlsprintf="$member->joined->html()"}</span> {{if $member->last_activity}} <br><span class='ipsType_light ipsType_small'>{lang="widget_member_last_active_date" htmlsprintf="\IPS\DateTime::ts( $member->last_activity )->html()"}</span> and replace this with:
<span class='mt_Title'><i class="fa fa-birthday-cake" aria-hidden="true"></i> {lang="mt_bday"}:</span> <span class='mt_Content'>{$member->birthday}</span>  
Many thanks to @V0RT3X666 providing me this solution!
Benny