Reduced Water pressure on forward bowl set

[prjsyd]

Hi All, I replaced my existing washbasin bowl set with new Shaw and Mason forward bowl set spindles and chrome handles. The water pressure has reduced tremendously. when I opened the tap and tried running water directly it comes with full pressure. Also, if I open the spindle from the basin it also shows high water pressure. Only it is flowing slowly from the tap. Could be possible the tap might be loosely connected to the centre point?