This might have been a licensor issue.
Oftentimes I hear that the licensor requests (whoever approves Dragon Ball merchandise for Toriyama) are odd-ball like color changes, expressions, "make it taller/shorter" etc. For example, I talked to Sideshow at SDCC 2014 about their 12" Batman figure and specifically asked them about working with DC comics and what sort of changes do they ask for. For Batman, they said DC wanted them to adjust the blue on the suit when they showed them the initial prototype.
However, I hear Bandai has almost full authority over their own Dragon Ball merchandise so I don't know who "approves" things for them.