Why Do MOGRT real time play back in timeline look low resolution?

[jjc.tri]

Why Does MOGRT real-time playback in the timeline look low resolution? However, when exporting, they look fine.

Timeline is 1080p 

full-resolution playback set 

high-quality playback enabled

Maximum render quality enabled

Super powerful system.

windows 11 / Latest Updates as of 11-15-2023 & Latest GPU Drivers as of 11-15-2023

Motherboard:

ASUS PRIME Z790M-PLUS D4

CPU:

Intel I7-13700K Processor

GPU's:

NVIDIA GeForce RTX 3060 Ti
Intel® UHD Graphics 770
Intel® Arc™ A770 Graphics

RAM:

128 GB MEMORY

DRIVES:

Solidigm™ 660p (formerly Intel®)
CT2000P2SSD8
Sabrent Rocket Q
SanDisk Extreme Pro 55AF SCSI Disk Device
SanDisk Extreme 55AE SCSI Disk Device
Micron CT4000X8SSD9 SCSI Disk Device
SPCC Solid State Disk
CT500MX500SSD1

Micron CT1000X8SSD9 SCSI Disk Device
SanDisk Extreme 55AE SCSI Disk Device
Crucial_CT750MX300SSD1
Samsung SSD 850 EVO 250GB
Crucial_CT750MX300SSD1
ST3000LM016-1N217V

[Ann Bens]

Which preview codec is used?