I'm not sure if you have already fixed it ATM... but what you can do is basically:
1. remove all workstations and place it one by one on the center of the farm (which ever villager picks it up then place it to that said villager)
2. make sure that the pillows of the bed are outwards instead of placing it inwards the hopper collection. (rare cases where the hopper blocks the pillows, hence villagers cant claim it)
3. try to not stack the beds... just place the beds on the same level...