Forum:A Question regarding Chaos MAX

So I often Duel on Yu-Gi-Oh! Nexus, which makes the players Duel with automatic effects, avoiding a lot of confusion. But since the site's still in its Alpha version, it's prone to a few errors, so here's a ruling which I want to verify:

My opponent had "Blue-Eyes Chaos MAX Dragon" (with double piercing), and with it, he attacked my "Vijam the Cubic Seed" who was in DEF Position (with 0 DEF). I then proceeded to activate "Dimension Wall", but for some reason he only took 4000 damage rather than 8000 (since Chaos MAX doubles its damage).

Should that happen, and if so, why?

Scheepybird (talk • contribs) 22:15, August 21, 2017 (UTC)