iPhone 3Gs home button click?

Could anyone that has an iPhone 3Gs help me out? My first iPhone was an iPhone 4, and now I bought a 3Gs too, so I can test my applications on older generation too. My problem is, that the home button on this brand new 3Gs does not have that click feel, that the one on the iPhone 4. Instead it's soft, like pushing rubber. Can anyone confirm if this is normal? It works ok, but it's just so different, what I'm used to on the iPhone 4...

 

Thanks. Damn, I have to go and get it replaced then, it definitely does not have the click feel.