Python turtle not running

Problem description:
Students run a python turtle file and turtle does not respond. Seems to be account based as if I copy and paste student code into my repl, code behaves as expected

Expected behavior:
When students click run, python turtle should make a square

Actual behavior:
When students click run, python turtle stays as previous run state. (Has shape from previous run)

Steps to reproduce:
Open a python turtle file. Enter some commands, eg. t.forward(100). Click run

Bug appears at this link:

Browser: Chrome
OS: MacOS
Device (Android, iOS, NA leave blank): Mac
Desktop app version (Avatar menu->“Version”) or NA: Browser
Plan (Free, Hacker, Pro Plan): Free