`next/head` was imported in `pages/_document.js`. This can cause unexpected issues in your application.
### Possible Ways to Fix It
Only import and use `next/document` within `pages/_document.js` to override the default `Document` component. If you are importing `next/head` to use the `Head` component, import it from `next/document` instead in order to modify `<head>` code across all pages:
```jsx
// pages/_document.js
import Document, { Html, Head, Main, NextScript } from 'next/document'