Why don't the house and the constellation coincide?

Palace 12 does not move and is arranged counterclockwise.

The 12 constellation is also arranged counterclockwise with the change of birth time. Just imagine with geocentric theory that 12 constellation revolves around you.

12 the size of the palace depends on what method everyone is used to dividing the palace. If it is a flat palace system, the size of 12 palace is the same.