everything is most likely "too ____" whether too hot, too cold, too arid, too filthy. my guesses are: it is likely hot and unregulated, so they go to the corners; or, since i'm sure the hides are either taken or inadequate, they squish themselves into the corner so at least two sides are "protected".
it's good you posted this so we could help you understand the circumstances and you could learn. TBH the majority of the forum is very anti-pet store, but we do not denigrate against anyone who does get a snake from a pet store.