Inconsistent pulse length/delay with torch and repeater combination

In the attached screenshots I've build the following circuit four times:
First a pulser which produces a 3 tick pulse, which is then negated by feeding the pulsar signal into a block with a repeater, on which a torch is attached.
The torch is used as the output.

The inner two are exactly the same (block by block) except mirrored (which does not affect the behaviour).
The same is true for the outer two.

The difference between the inner and outer is only by placing the negation part one block diagonally away.

If the pulsar is fed an on signal the following can be noticed:
1) Although the circuit logic is the same as is the repeater count, the inner ones signal is a tick later than the outer ones
2) If I place a repeater near the torch the pulse length is changed by one tick