Excess DIV appears at the bottom after using the plugin

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Hello
After enabling the plugin, an HTML code will appear at the bottom of the website
I searched through the settings and couldn’t find the place to turn it off. I only discovered it when I received a search engine prompt that there were multiple h1 tags on the page
I think this may be a bug
Partial code is as follows

<div id="wp-link-backdrop" style="display: none"></div>
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<div id="wp-link-wrap" class="wp-core-ui" style="display: none" role="dialog" aria-modal="true" aria-labelledby="link-modal-title">
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<form id="wp-link" tabindex="-1">
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<input type="hidden" id="_ajax_linking_nonce" name="_ajax_linking_nonce" value="4401c35f5f" /> <h1 id="link-modal-title">Insert/edit link</h1>
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<button type="button" id="wp-link-close"><span class="screen-reader-text">
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Close </span></button>
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<div id="link-selector">

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