Are you using the AV transformation or the AV Cloud Web Service?
What is the mode of validation that you are using?
As per my understanding:
For the first address:
street = Händelstr.
house number = 5
postal code = 35279
city = Neustadt
Whenever the matching scope is set to Street/Delivery point level, the preference would be given to Street and house number details. In this case, the same street 'Händelstr' is present under two postcodes '35279' and '31535' but house number '5' is present only in '31535' and hence corrections and made concerning it.
Whereas if you try checking for the house number '3' or '6', these are present in the postcode 35279 and it is getting validated as well without any modification in the postcode.
For the second address: The provided street name is incorrect and changes are made to it as part of the correction and those values would not be moved to the residue. The addresses where entire fields are getting dropped can expect those values to be present in the residue.
Hope it helps!