Mmh I think you had the bug (not really a bug) with the boxes, you can stack on the left but I think you just kept placing your box on the highlighted spot. This mechanic was a real struggle for me with tons of bugs so didn't had the full time to fix all of it haha.
I didn't want to skip the scene with the customers cause I like just watching them do stuff, and the thing you can do is prepare for the next day like placing boxes around the shop.