Out of white sub rolls

I love Jimmy John’s and this didn’t change my feeling about them but was weird AF. Show up today at 11:30am to a store in MD. I’m in line and they said just so you know we don’t have any sub rolls. We can do unwiches, tortillas, or whole wheat bread. No biggie I went home and made lunch there. I was polite, but am genuinely curious. How does that happen or what do you think happened? Thanks.