Why some of the node label doesn't display outside the node?

[xgh127]

My graph is like this:

My config is like this:
visConfig: { nodes: { shape: 'dot', //设置节点形状 // size: 20, //设置节点大小 font: { size: 18, color: "blue", }, },
And I've already set:设计施工单位: {label: "name"},
Why not all nodes' labels display outside the node?