Conflicting wiring diagrams
It sounds like you are trying to match your situation up to the wrong diagram. The diagrams vary because the applications vary. 


Power is supplied at the lamp, and goes no further. There is a spur (switch loop) for the light switch. (6 wires + earth)
Power is supplied at the lamp, and constant power is carried onward to other loads. There is a spur (switch loop) for the light switch, which switches this lamp only.  (8 wires + earth)
Power is supplied at the lamp, and goes no further. There is a spur (switch loop) for the light switch, which also switches this and other lamps.  Switched power is carried onward to those other lamps.  (8 wires + earth)
Power is supplied at the switch and powers only this lamp.  (4 wires + earth)
Power is supplied at the switch, and powers this lamp and also onward lamp(s).  (6 wires + earth) 


The splice blocks are designed to have enough screws for all the above cases.  There are yet other cases, but they are outliers.