Ad displaying multiple times

Hi,

I have an advert placement which is after first post on every page, but it's displaying twice after the 2nd page - after the first post and the 2nd page.

Please could someone assist? Code is;

Code:

<xf:if is="$thread.node_id == '95'">
        <xf:if is="{$post.position} % {$xf.options.messagesPerPage} == 0">
            <div style="margin: 30px; text-align: center;">
                <a href="link" target="_blank">
                    <img src="link" alt="" style="width: 100%; max-width...

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