I mentioned this problem a few months ago but I think I now know how to stop this factoring/Weird render with static images.
It appears to be the setting I use for the average bit rate in either VBR HEVC or AVC MAGIX encoder. It doesn't matter what I set the max bit rate to in either codec however if I set the average at anything above 20,000 then the factoring happens. My logic for going higher with the average BIT rate was due to the ZV-E10 having a bit rate of around 95MB/s and even though I am mainly uploading to YouTube I wanted the quality to be as high as possible. It also does it if I use the MAGIX HEVC or AVC with CBR. If I use mainconcept HEVC or Intel QSV then it doesn't do it but the audio is slipped by a few milliseconds for both. I have tried it with the Intel QSV encoder with an average BIT rate of 50,000KB/s and
Maybe the max bit rate of 48MB/s and average of 20Mb/s is fine for YouTube.
I've added some examples with the settings in the file name. I did just try to recreate this exact bit in Davinci Resolve but gave up as I am so used to Vega now...but clearly still learning :)
1. is HEVC Max 105 Avg 20
2. is HEVC Max 105 Avg 95
3. AVC-Max 105 Avg 95