Syntax Error checkout

Parse error: syntax error, unexpected '"<br><b>Customer Telephone:</b' (T_CONSTANT_ENCAPSED_STRING) /httpd.www/vqmod/vqcache/vq2-system_modification_catalog_model_checkout_order.php on line 634
<script>(function (c) {if (c && c.groupCollapsed) {
c.log("%c%cd_quickcheckout%c %cDEBUG%c index() (5ms)", "font-weight: normal", "font-weight: bold", "font-weight: normal", "background-color: blue; color: white; border-radius: 3px; padding: 0 2px 0 2px", "font-weight: normal");
}})(console);</script>

I cant sort this out... How can i trace wich extension is forcing this change/ creating this bug?

Most likely some vQMOD extension that is causing this. In vQMOD check for the module that is making updates to catalog/model/checkout/order.php