Client Server orb desync problem

We recently set up a server with 4 players and created a simple (regular) spider spawner trap. The opening is on a corner and has an iron door on either side of the corner with a fence post in the corner. When killing spiders, the player stands in front of either open door where water pushes the spiders. The orbs swirl out the door and around the player but are not absorbed. If the player jumps into the water to pick up the string/spider eyes, the orbs are then absorbed. Server errors were reported that may, or may not, be related.