麻烦 - 不同密度的相同布局

I am testing my app in HVGA and WVGA800 resolutions both are Normal Screen, so I created images for medium and high density, but I can't understand why my text "Orientação" (title) in HVGA is decentralized compared to WVGA800, I coded with "dp" unit as below:I am testing my app in HVGA and WVGA800 resolut