Problem with Dead or Alive 2 (PAL, no backup!)

[cheatengine]

I got a Japanese NTSC Dreamcast and an original PAL copy of DoA 2. I'm using Action Replay CDX for playing imports. The problem I got is that when I run DoA 2 via Action Replay, the game's screen is shifted towards the bottom, leaving the upper third blank, while visual elements at the bottom (such as the fighters' feet) can't be seen anymore. I've tried the DCX boot disc, too, but it's the same issues.

Has anyone experienced the same and is there a way to fix this?