[]模拟器分辨率问题

我用的是mac系统，每次重新启动模拟器的时候，会出现stage的宽高变化了：
 

printScreenInfo("aaa");
Laya.loader.load(resArr, Handler.create(this, this.onResLoaded, [this.mainuiView, winName, zOrder]));
printScreenInfo("bbb");


private onResLoaded(parent:Laya.Node, winName:string, zOrder:number):void {
    printScreenInfo("ccc");
    this.doOpen(parent, winName, zOrder);
}


aaa Screen Info: stage=(750,1334), stage design=(750,1334), browser=(300,278), browser client=(300,278), pixel ratio=1
bbb Screen Info: stage=(750,1334), stage design=(750,1334), browser=(300,278), browser client=(300,278), pixel ratio=1
ccc Screen Info: stage=(1236,1334), stage design=(750,1334), browser=(278,300), browser client=(300,278), pixel ratio=1
 
如上所述： 在加载完的回调那里，stage的宽高发生了变化。
 
但是如果我点了”重新加载“，刷新一遍的话，就好了：

aaa Screen Info: stage=(750,1334), stage design=(750,1334), browser=(414,741), browser client=(414,741), pixel ratio=1
bbb Screen Info: stage=(750,1334), stage design=(750,1334), browser=(414,741), browser client=(414,741), pixel ratio=1
ccc Screen Info: stage=(750,1342), stage design=(750,1334), browser=(414,741), browser client=(414,741), pixel ratio=1
 
 
为什么会这样子的呢？