I am using a high resolution texture pack for Hexen, downloaded as "Hexen_High_Resolution_Pack.rar"
High Resolution textures are displayed off-center for some sprites. Weapon sprites (Cleric's snakebite staff) are shown in the top left corner of the screen instead of bottom center. Flying enemies (Afrits and Dark Bishops) are shifted down and right from the normal position, so I have to shoot at the empty space above and to the left of the sprite in order to hit them.
This problem occurs in versions 1.9.8, 1.9.8-1 and in 1.9.9 build 600.
This doesn't happen in version 1.9.0