How to center the text on 'edges'

[wei-X7]

Why are some 'unauthorized' displayed in the middle, while others are not? How to make all 'unauthorized' displayed in the middle?

Options：
this.options = {
configure: false,
nodes: {
chosen: true,
shape: "image",
image: require("@/assets/access-control.png"),
font: {
color: "#000",
size: 12,
},
physics: false,
},
edges: {
arrows: {
to: {
enabled: true,
scaleFactor: 0.5,
},
},
font: { align: "middle" },
physics: false,
smooth: true,
},
interaction: {
hover: true,
dragNodes: false,
},
layout: {
hierarchical: {
enabled: true,
direction: "LR",
levelSeparation: 180,
nodeSpacing: 100,
},
},
};