4k footage becomes jittery once in FCP timeline and after export

Hi I shoot with a DJI Mavic Zoom 2, 4k footage. The footage looks perfectly smooth and everything you'd expect with 4k, this is also true when I'm viewing the footage in the events section of FCP.

However once I put the footage into the timeline on FCP it becomes a little jittery and in some places it almost appears a little bit 'flashy' in high fidelity areas. In other words - its just not right once it lands in the timeline. This is also true after exporting as a master file.

Any help would be greatly appreciated.

Specs:

MacBook Pro 16 inch (2019) bought in 2020

Final Cut Pro latest with all updates