A loss doesn't always necessarily mean a team has to fall in the power rankings, as evidenced by the Cleveland Browns following their loss to the San Francisco 49ers. Generally speaking, a loss will drop a team, but not when that team is appearing as high as number two on some power rankings around the 'net. The Browns weren't able to beat the 49ers and that's understandable, so instead of dropping, they're holding.
ESPN concurs, leaving them in their 24 spot:
24. Coach/offensive coordinator Pat Shurmur has made little impact on Cleveland's 25th-ranked offense. (Walker)
That offense has been pretty bad, but again, the 49ers have one of the top ranked defenses in the National Football League, so the struggling Cleveland offense had essentially no chance when it all came down to it. The Browns are low, but in all honesty, they're probably better than that ranking, as it stands. We'll see where they end up in other rankings.