Single Event Page shows php code since last update (5.5.3)

Hi,

since the last update there are a few php code “rests” to be seen on all single event pages:
'; }?> '; }?> '; }?>

I use the following code to format my page:

#_EVENTNOTES
<table cellpadding="0" cellspacing="0" class="events-table" >
    <tbody>
	<tr>
		<td style="width: 8em"><strong>Datum: </strong></td>
		<td>#l, #d.#m.#Y - #@l,  #@d.#m.#Y</td>
	</tr>
	<tr>
		<td><strong>Zeit: </strong></td>
		<td>#H:#i Uhr  - #@H:#i Uhr</td>
	</tr>
{has_location}
	<tr>
		<td><strong>Ort: </strong></td>
		<td>#_LOCATION</td>
	</tr>
{/has_location}
	<tr>
		<td><strong>Dozent(in): </strong></td>
		<td>#_ATT{Dozent(in)}</td>
	</tr>
<?php if(isset($attr['Preis']) && !empty($attr['Preis'])){
    echo '<tr><td><strong>Preis: </strong></td><td>#_ATT{Preis}</td></tr>';
}?>
<?php if(isset($attr['Anmeldungbis']) && !empty($attr['Anmeldungbis'])){
    echo '<tr><td><strong>Anmeldung bis: </strong></td><td>#_ATT{Anmeldungbis}</td></tr>';
}?>
<?php if(isset($attr['Anmerkung']) && !empty($attr['Anmerkung'])){
    echo '<tr><td><strong>Anmerkung</strong></td><td>#_ATT{Anmerkung}</td></tr>';
}?>
 </tbody>
</table>
<div class="eventmap">#_MAP</div>

The output obviously comes from the php conditional statements, but I can´t find any php error in my code.
My domain host has the latest php version (> 5.3)

Are there any changes in the update which could trigger the output?

https://wordpress.org/plugins/events-manager/