Youtube Render looking very poor despite high settings
Link to youtube video: https://youtu.be/qaNtl0jOIeU
If you observe the video at 0:04 and after 0:05, you can see that it magically sharpens a certain part of the video as shown here: 
I want to know what is happening here? Can you guys help? Why this is weird switch in sharpness happening after 0:04 mark? This video was rendered using Media Encoder (h264, 1440p, tried using 16-25-45 bitrate, but this 'switch' keeps on happening).
