Thanks for reporting the bug. Can you explain the can't jump while running left a bit more, please?
First time I am hearing about this problem.
Where in the game is this happening? Is it happening across multiple rooms or just a single room? Do you remember where you were and what you did when the behaviour started occurring for the first time or was it occurring from the very beginning of the game? (this will be the most useful answer if it is a bug). Are you playing the game using a keyboard? Have you double checked its not a hardware issue like your keyboard or a controller for some odd reason?
Well done finding the easter egg. Had you completed the game prior to finding the bug? Cheers.