CS50 DNA pset6 only works with small.csv, not large.csv

I’m having troubles finishing this problem, when I include “temp = 0” on line 32, as it currently is, it doesn’t work at all, but when I remove it it only works on small.csv (plus I feel it is necessary anyways). Really confused with what logic is going wrong in this.

from sys import argv, exit
import csv

if len(argv) != 3:
    print("Usage: python dna.py data.csv sequence.txt")
    exit(1)

with open(argv[1], 'r') as csv_file:
    csv_reader = csv.reader(csv_file)
    for row in csv_reader:
        header = row
        header.pop(0)
        break

dictionary = {}

for item in header:
    dictionary[item] = 0

with open(argv[2], 'r') as dna_txt:
    dna_reader = dna_txt.read()

for key in dictionary:
    temp = 0 
    max_count = 0
    for i in range(len(dna_reader)):
        if dna_reader[i : i + len(key)] == key:
            temp += 1
        else:
            if temp > max_count:
                max_count = temp
            temp = 0
        i += len(key)
    dictionary[key] = max_count

with open(argv[1], 'r') as file:
    table = csv.DictReader(file)
    for person in table:
        count = 0
        for dna in dictionary:
            if int(dictionary[dna]) == int(person[dna]):
                count += 1
            else:
                count = 0
            if count == len(header):
                print(person['name'])
                exit(1)

print('No match')
exit(0)