The Freedoom medikit sprites (including the stimpack and berserk pack) have a red cross emblem on their side. The red cross is a humanitarian symbol recognised by and protected under the Geneva convention. Laws in most countries restrict its use, and the Canadian Red Cross has actually spoken out against the use of the symbol in video games. Real medical kits don't actually use a red cross for the same reason.
Suggestions for how to fix the problem: Remove the cross
Chang