Are you running any replacement home apps? Maybe it could also be another app interfering? Worst comes to worst...go to a verizon store...show them the problem...hard reset your phone and if this does not help they'll replace it!

 

i use folders in a similar way that you do. the same happens to me after a few days of uptime. i think it gets left open and stuck sometime after launching an app or shortcut from it. who knows... power down... power up. fixed it for me.