Thankfully, these polls don't matter, but I can't help but laugh incredulously seeing how Iowa falls 9 spots after losing to an unranked 3-2 team (that is now ranked #25) and behind PSU! But that other team just means more.
That's a little bit of an apples-to-oranges comparison.
I was surprised Bama only dropped 4 spots (I expected more like 6), let's look at some factors:
Alabama is a known powerhouse program, while Iowa was a somewhat suspect Cinderella.
Alabama lost by 3 on a last second FG; Purdue won by 17 and dominated most of the game.
Kyle Field is one of the most challenging venues for visitors in college football. Iowa lost at home.
A&M is loaded with talent, but is having an underperforming year. Purdue had a few bright spots, but nowhere near the overall talent level.
As you said, these polls don't matter, but I can at least somewhat see where the pollsters might be coming from. We'll see what the REAL pollsters say after next week.