Footage looks pixelated in premiere and on export

Hey All,

I have some footage from a DJI spark and am importing as .mp4 into premiere CS6 on a PC.

I am allowing the footgae to dictate the timeline (so no mis-match issue). Its 29.97 fps full HD.

On a series of videos I have of a sunset pixels are visible in adobe (playback and still). Im playing back full scale and no frames are dropping.

This footage in video player, VLC etc the footage looks fine.

I have also tried rendering out the video and no matter how I render it shows these pixels.

I am new-ish to Premiere but have made other videos, no problems and also its only these sunset clips (i have 3) that are showing this error.

Any ideas. Happy to try anyting, provide more info etc. Below are some grabs of the pixelation.

Thanks so much!

Original

When in premiere and on export