Zend certified PHP/Magento developer

strange order with html code in the first name

I have got last days some orders which look like:

Ihre Bestellung #000001863
Aufgegeben am 04.03.2023, 02:54:47
Rechnungsinfo
Herr <!DOCTYPE html> <html style="font-size: 62.5%; -webkit-text-size-adjust: 100%; -ms-text-size-adjust: 100%; font-size-adjust: 100%; background-color: #ffffff;"> <head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head> <body style="margin: 0; padding: 0; color: #333333; font-style: normal; line-height: 1.42857143; font-size: 14px; font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif; font-weight: normal; text-align: left; background-color: #ffffff;"><p style="margin-top: 0; margin-bottom: 10px;">foobar</p></body> </html> Fehler beim Filtern der Vorlage: Warning: system() has been disabled for security reasons in /www/agoshopat01/www/agoshop.at/vendor/magento/framework/Filter/Template.php on line 205 Beticker
addy
cuty, 1250
....

Can somebody tell me if I have a problem in my shop or if it is fake or spam.

my shop is agoshop.at

kindly regards for any answer