For all you know, the crew did catch it on the post flight, wrote it up, and depending on the regional, going through dispatch, then maint, then the moon, and waiting for Jupitor to align with Venus, They finally got around to fixing it, and by that time the other crew was there so it seemed like they were the ones to catch it.

Most of these companies just are not run very well these days, and even when crews are pro active about things, they call it in to dispatch, and that dispatcher does not even know what aiport there at!!!! Im not trying to monday morning QB here at all.