Some face regions are drawn incorrectly. They look like the face region would correspond to the faces if the picture was rotated. Maybe the picture was rotated at some point in the past, but the face region remains. I think it has to do with the camera model, since it happens in most vertical pictures taken with a specific camera (Panasonic DMC-FZ38). See example picture attachment. The xmp info is written directly into the file. The same face regions in these pictures are displayed correctly in other software (Picasa).
The attachment failed due to file size. I uploaded the picture and a screenshot showing the incorrect face regions to google drive. This is the link https://drive.google.com/open?id=16FscWv-z7qzedM5dbc8ZxGkAZ11sGP2r
*** This bug has been marked as a duplicate of bug 372340 ***
7.0.0-beta1 is out with new Face Recognition algorithm based on Deep Learning/Neural Network API from OpenCV https://download.kde.org/unstable/digikam/ Please test and give us a feedback Thanks in advance Gilles Caulier
Git commit 32bb16fee6b2676b30bf843bf3e083a23084cd3d by Maik Qualmann. Committed on 19/01/2020 at 08:37. Pushed by mqualmann into branch 'master'. read and write not aligned face metadata from image FIXED-IN: 7.0.0 M +2 -1 NEWS M +7 -4 core/libs/database/item/scanner/itemscanner_photo.cpp M +3 -29 core/libs/fileactionmanager/metadatahub.cpp M +0 -6 core/libs/fileactionmanager/metadatahub.h M +6 -5 core/utilities/imageeditor/main/imagewindow.cpp https://invent.kde.org/kde/digikam/commit/32bb16fee6b2676b30bf843bf3e083a23084cd3d