<p>I can only reproduce this in Chrome 80 when following these steps:</p>
<ol>
<li>Go to <a href="https://www.fishersgreensc.org.uk/" rel="nofollow">https://www.fishersgreensc.org.uk/</a></li>
<li>Open openstreetmap.org in a second tab</li>
<li>Reload <a href="https://www.fishersgreensc.org.uk/" rel="nofollow">https://www.fishersgreensc.org.uk/</a> in the first tab.</li>
</ol>
<p>When skipping step 2, I don't see the effect you're describing.</p>
<p>Can you confirm if this is what you're doing?</p>

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