OK, here you are. Quote from the H&D Deluxe Ultimate Mod 3.0 Readme:
"For those having in-game issue with stationary characters (both friendly and enemy) falling partially into surface please install DXwrapper to fix the problem (https://github.com/elishacloud/dxwrapper). Copy the following files from the Dxwrapper folder into your H&D Deluxe/bin directory: d3d8.dll, ddraw.dll, dsound.dll, dxwrapper.dll and dxwrapper.ini. This should fix the bug, which is not related to the mod itself (it could happen also in vanilla game on modern OS like Windows 10)."
Hope it helps!