Cant get left back edge high

i was working today about 3h and i found no way to get the left back edge (D) high although i followed this video.

https://youtu.be/h7ZTq2dDTkM?si=-FKM34RBenNRq4wO

has anyone a idea … i am a bit frustrated as i had allready 0,3 as you see on the picture

YouTube3D Printers & a Whiteboard

RatRig V-Core 3: How to Get a Square Frame

This video is for those who struggle getting bed meshed with their RatRig V-Core 3.
Please feel free to jump to the chapter you are interested in.

0:00 Intro
1:05 about the v-core 3 frame and bed leveling
8:26 what to take care of in the building phase
9:17 the right square
10:09 build tips
16:50 adjusting the frame according to your bed mesh
...