dataTables pagination number buttons expand

I am developing further dataTables in my project I am doing and is coming on nicely but today I have added in numbers for the pagination under the dataTable and have noticed if I click on a number in the pagination, it expands. I have attached a screenshot of the issue. Below is the current coding I have

<script>
jQuery(document).ready(function($) {
// Initialize Datatables
$.fn.dataTable.ext.classes.sPageButton = 'button button-primary'; // Change Pagination Button Class
} );...

dataTables pagination number buttons expand

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