Playerscripts causing increased speed

So with the release of playerscripts, there has been some unusual behaviour being exhibited in one of my places and apocalypse rising where you can run around really fast by attempting to walk backwards.

The video shows the issue better than I can explain it in text so here:

Link to place

It can be patchy at times, hence the video was posted to show it.

What game is this, and how easy is it to reproduce?

This issue should be fixed with this weeks release (Wednesday night).

Thanks for the quick response, I edited the OP with a link to the place