Bug Report for https://neetcode.io/problems/duplicate-integer

Please describe the bug below and include any steps to reproduce the bug or screenshots if possible.

I tried to different practices with Python code, but the programming language doesn't exist anymore. I don't know how but this is the bug I faced out of the blue. I've tried restarting my PC, restarting my browser, signing in and out but the result is remains the same.

I have paid for PRO subscription expiring on Jan 11 2026 and this is the bug I face. I would highly appreiciate it if you fix this bug ASAP.

Hoping to hear back from you.