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Both machines have single large 4k displays. Similar hardware. Here is the .rdp file that I use to connect:
screen mode id:i:2
use multimon:i:0
desktopwidth:i:3840
desktopheight:i:2160
session bpp:i:32
winposstr:s:0,1,1120,133,3840,2130
compression:i:1
keyboardhook:i:2
audiocapturemode:i:0
videoplaybackmode:i:1
connection type:i:6
networkautodetect:i:0
bandwidthautodetect:i:1
displayconnectionbar:i:1
enableworkspacereconnect:i:0
disable wallpaper:i:0
allow font smoothing:i:1
allow desktop composition:i:1
disable full window drag:i:0
disable menu anims:i:0
disable themes:i:0
disable cursor setting:i:0
bitmapcachepersistenable:i:1
full address:s:XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
audiomode:i:0
redirectprinters:i:0
redirectcomports:i:0
redirectsmartcards:i:1
redirectclipboard:i:1
redirectposdevices:i:0
autoreconnection enabled:i:1
authentication level:i:0
prompt for credentials:i:0
negotiate security layer:i:1
remoteapplicationmode:i:0
alternate shell:s:
shell working directory:s:
gatewayhostname:s:
gatewayusagemethod:i:4
gatewaycredentialssource:i:4
gatewayprofileusagemethod:i:0
promptcredentialonce:i:0
gatewaybrokeringtype:i:0
use redirection server name:i:0
rdgiskdcproxy:i:0
kdcproxyname:s:
drivestoredirect:s:
When I connect it drops for a second to something like 3200x1600
and moves all my open windows to the top left of the screen. Then returns to the correct resolution.
I recently changed from 3 1080p monitors on the machine that use to connect from to one 4k. The other machine (the one the connect to with RDP) had 2 1080p monitors and I replaced them after a while too with one 4k monitor.
Identical Windows 10 installations on both, with all updates installed.