Working solution is not accepted by Kata

[Diasell]

KATA: Sum of many ints
LANGUAGE: Python

MY SOLUTION:

def f(n, m):
    rest = n%m
    sum1 = (m*(m-1))/2
    sum2 = (rest*(rest+1))/2
    return sum1 * (n/m) + sum2

Description
Each time i run the code it gives me an random test failure and if i run the same script locally on my machine i would get the correct result

Check the screenshots that i've attached to this issue:

[kazk]

Next time, ask kata specific questions on kata discourse.

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Your solution works using Python 2 (your PyCharm has Python27), but not Python 3.
You can fix this by selecting Python 2 on Codewars, or by using floor division (//) in Python 3.