Each route prefix supplies the mask used for an exact destination comparison.
Each prefix supplies a mask
A prefix length becomes a mask, then the destination is ANDed with that mask.
The lab row keeps more bits
The narrow row has prefix length 25, so its mask keeps more leading address bits.
Destination AND mask gives a network
For that narrow row, destination AND mask gives 192.168.1.128.
dst∧mask=192.168.1.128
Summary
A row matches only when the masked destination equals that row's network.
prefix length=25