What makes Arby's so inconsistent?

A month ago I had the most incredible beef n cheddar I've ever had, but today I got one that was super mid.

Why is Arby's so inconsistent? It almost seems like there are different types or cuts of roast beef that they use, because sometimes it's thin and fresh, and other times it's thicker and just seems old.

I honestly feel like the quality consistency might be more all over the place than Popeye's lol