Date Detection not working every try. Inconsistent output

Currently doing the chapter on regex and the project asks for detecting whether the date is valid or not. I have the following code that works and doesn't work. I get these:

33/4/2022

Incorrect date

33/4/2022

0.004080118694362018

33/4/2022

0.004080118694362018

import re

months = {1: 31, 2: 28, 3: 31, 4: 30, 5: 31, 6: 30, 7: 31, 8: 31, 9: 30, 10: 30, 11: 30, 12: 31}

dateRegex = re.compile(r'''\b(
    (\d{1,2})           #Day
    (\-|\/|\.)          #seperator
    (\d{1,2})           #Month
    (\-|\/|\.)          #seperator
    (\d{2,4}))          #Year
    \b''', re.VERBOSE|re.I)
datematch = dateRegex.findall(input('Please enter a date: '))

for i in datematch:
    day, month, year = int(i[1]), int(i[3]), int(i[5])

def dateValidity(day, month, year):
    if year < 1000 or year > 2900:
        print('year incorrect')
    
    elif (year % 4 == 0 and year % 100 != 0) or (year % 4 == 0 and year % 400 == 0 and year % 100 == 0):
        months[2] = 29
    
    elif month not in months:
        print('Incorrect month')

    elif day > months[month]:
        print('Incorrect date')

    else:
        print('Date Valid')


dateValidity(day, month, year)

The output changes after the first result and the next input do not return any of the string results that i coded but only return as floats but I can't trace why. Any ideas?