API loaded twice after change a custom field value in jira plugin development

[JiaxinWang]

I'm developing a jira plugin.

There are two components: one is a custom field, another is a panel(call an API and then show some information) in the issue.

Below is the normal scene:

If I click the refresh button, the panel is loaded. Or if I  change the custom field value, the panel is reloaded according to the field value.

But after I change the custom field value, the panel is loaded twice, How can I solve the problem???