With the entrance being turned 180 degrees it's possible all the foragers went into the other side - since it faces the same direction. Does the other side of your split box have increased numbers? Bees aren't as "loyal" to one colony as you'd think and if they are willing to work and/or loaded up with pollen or nectar - the parent hive will welcome them on in.
I've always had good luck moving hives up to 3 feet, but if you switch them around they sure get confused. It may have been a better idea to switch the nuc 180 degrees for a week or so before moving it to the other end of your bench. This way they would be used to entering their home from the opposite direction.
If you're seeing increased numbers on the other side you can always rotate the box 180 degrees, swapping the colonies to try and equalize the foragers. Things usually equalize as new foragers emerge from the hive...but with that said I'm not sure where you're located and if you're gong into winter, or into your flow like we are here.
I've always had good luck moving hives up to 3 feet, but if you switch them around they sure get confused. It may have been a better idea to switch the nuc 180 degrees for a week or so before moving it to the other end of your bench. This way they would be used to entering their home from the opposite direction.
If you're seeing increased numbers on the other side you can always rotate the box 180 degrees, swapping the colonies to try and equalize the foragers. Things usually equalize as new foragers emerge from the hive...but with that said I'm not sure where you're located and if you're gong into winter, or into your flow like we are here.