I cannot say sth for sure but i have two suggestions if i understood the problem that ypu are having
– ypu should extract 12 images instead pf 24 to get rid of more blurry or bad images, also you should erase bad src face extract
– it is motion blurry, there may be either model collapse issue if you selected wrong settings for the work or src is not good enough or diversed or small chance but your files in the internal may gor virused or spme phyton files may be deleted
– if the original image is seen in the result video after merging, it is either not trained enough which means you should train more – if it continues, you have one solution – you have to delete that 1/24 image in premier pro by extending video into 24 frames