Conveyor belts - having a weird problem

Hey, I made conveyor belts: https://pastebin.com/s277PD0f If I place the belt facing right and then next one to the right of it facing down they connect correctly. (look at the first image) InputDirection, OutputDirection and Direction are set correctly. But then MoveItems is called (it is called every frame) they break. (second image) Left belt then has InputDirection: Right OutputDirection: Right Direction: WE and right belt has InputDirection: Left OutputDirection: Left Direction: NS which is totally wrong. Any ideas what I did wrong here?

Pastebin

public IItemReceiver Parent;public IItemReceiver Child;public Sprit...

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