Why is the first corner of every layer always like this

Can anyone offer any advice on why the first corner of every layer is like this ?

First layer one corner always not filled, what is the reason ? : r

Rubik's Cube - Wikipedia

Calibration and first layer problem - LulzBot Mini - LulzBot

Layer by Layer - Wikipedia

How to Solve a Rubik's Cube: 4 Different Ways

Algorithm to solve Rubik's Cube - GeeksforGeeks

Rubik's cube. My notes on how to solve the last layer of a 3 x 3

Could someone explain why this layer isn't lining up? I do my

Core

QuiltFabrication Patterns and Tutorials: Reduce Bulky Corners

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First Batch Shipped Out] FAQs of Dual Extrusion 3D Printing Module