DS-2CD2047G2-L Firmware problem

[Roxana31]

I performed a firmware update today on my DS-2CD2047G2-L camera, directly from the Hikvision website, to version Firmware_V5.7.15_240411. I noticed that in areas where motion is detected, even with leaves, strange codes appear on the image, both in real time and on recordings. I have never seen anything like this before, although I have had surveillance cameras for many years. Could this be a bug in this firmware?

 

[Roxana31]

Code

 

[alastairstevenson]

I noticed that in areas where motion is detected, even with leaves, strange codes appear on the image, both in real time and on recordings.

What elements are ticked in the camera web GUI under System | System settings | Metadata tab ?