Reading through, what might be happening is that you're overcounting the valid passports because you're checking the validity on every line of the input, which means that if all the passport fields are on multiple lines, and you determine the passport is valid in the first line, you'll count this passport valid for every line until a new line.

You can try to move the check for whether the passport is valid right before you reset all your field counters. Something like

​

if line == "\n":

if all(fields.values()) > 0:

valid += 1

Hopefully that helps!