This is likely due to strong winds. It is preference to park aircraft with nose into the wind to minimise any potential damage.
If there is not enough stands to provide this especially for aircraft that is on the ground for a long period then the airport authorities and ground handling agents will deviate from normal parking positions on stands.
They will still need to be towed off stand especially if there is no jet blast screens to prevent any damage to equipment, buildings or injuring ground staff/passengers.