I NEED HELP IN CALIBRATION CUBE.

Hi, I have a question about the calibration cube. I measured the printed calibration cube, and I found out that there is a bit different in sizes as it should be! How can I measure the difference and set the new calibration measures?
My printer is K1 Max, and I use the “Creality Print V5.1”. (My device is almost new but the functionality of it had been reduced. for example, the sample boat was printed perfectly but now after a while, the boat is not perfect, and it has some issues.)
Your help seriously will survive me, thanks!
Thank you!

What has happened to the boat with V5.1? Have you tried CP4.3.8 to see if there is any change?