sealing granite

Hi,

We had a granite kitchen counter installed last week, and the installers said that they sealed it.  However, we have noticed a lot of absorption of liquids into the granite.  I was under the assumption that if it was sealed, liquid would bead rather than be absorbed.  We've had no luck with getting answers from the granite contractors, so I'm hoping that you have some advice.  If they did seal it, could I damage the granite in any way by sealing it again?  Or will it actually still absorb liquid, even if it's sealed?

Thanks,

Becky