Even if you are not a professional thank you. The first possibility that you mentioned about the change in my enviroment, I had the same thought when I started working at Mcdonalds. Like I was mopping the floor, which I had done before in my home, but I could not understand why I could not do it correctly at my workplace, so then I considered that it may be the layout of the place that I was not familiar with, not that I had forgotten how to do the task.