Placing doors next to blocks or other doors will sometimes cause the doors' hinges to not line up with the half of the block you clicked on. The hinge instead lines up on the opposite side of the block.
Example: If you place a door by blocks on its right side and click on the left half of the block under the door, the hinge does not line up with the left half of the block and instead, the hinge is on the right side, next to the blocks on the side of the door. The same happens vice versa.
Example: If you place a row of consecutive doors next to one another, the hinges will not line up with the half of the block you clicked on. This only happens when the half of the block you clicked on is next to the handle of the neighboring door.

What I expected to happen was:
The hinges of the doors would line up with the half of the block you clicked on.

What actually happened was:
The hinges adjusted themselves to be opposite the half of the block you clicked on, due to nearby doors/blocks altering the hinge of the door.

Steps to reproduce:
For adjacent blocks:
1. Place a 1x1x2 pillar of blocks.
2. Attempt to place a door with its hinge opposite the pillar of blocks.
3. Notice how the hinge flipped so that the hinge is next to the pillar
instead of opposite the pillar, it doesn't matter if you placed the door to the left or to the right of the pillar.
For adjacent doors:
1. Place a door.
2. Place a consecutive door next to the previous one, and attempt to place the door, so that the hinge is next to the handle of the previous door.
3. Notice the hinge, again is flipped, so that the hinge is opposite the half of the block you clicking on. Reproducing this will only work if you place the door, so that it is next to the handle of the previous door.