We have one brain but divided into 2 hemispheres, the left and the right. Though they work together, sometime there could be conflict.
This is because each brain has its own functions and has different languaging system.
For eg your left brain that is logical knows you need to do thing this way but you end up doing it another way. The right brain sees things differently and thus surface to you another way.
The side that has a more dominant thought wins.