（BUG）在对战中按ESC进入菜单会导致“菜单”按钮跑偏

暂时的解决方法：进入下棋场景之后，请用鼠标指针点击“菜单”来进入菜单（第一次是鼠标指针点击的就可以）
貌似是我这里更新了Unity之后出现的，有经验的大佬请不吝赐教
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BUG: When pressing "ESC" to show menu during a game, the "Menu" button will shift to random position afterwards
Temperarily you can use your mouse instead (by clicking the "Menu" button)
Your advice or solution will be greatly appreciated!