RRD4J and n3-line-chart not show value

IMHO such behavior sounds weird!
I would try three separate .items lines or even three seperate archive setups.
But that all is fishing in the dark.
The other archive setups are working correctly or do they also show such behavior?

So this part is solved.
The problem was a space in the item state ( like " 69"). Since the code of the arduino was self written it could be changed.
@Toon
Please start new a new thread for the flipping value problem and please mark this one as resolved ( by ticking the checkmark under an answer).