Removing that line from the CTFM page code will prevent the issue.
<mvt:assign name="g.http_referer" value="s.http_referer" />
<mvt:if expr="'CTFM' CIN g.http_referer OR 'contact-form' CIN g.http_referer">
<mvt:exit>
</mvt:if>
<mvt:if expr="NOT ISNULL g.website">
<meta http-equiv="refresh" content="0;url=&mvte:urls:NTFD:auto;" />
<mvt:else>
<mvt:assign name="g.eol" value="asciichar(13) $ asciichar(10)"/>
<mvt:if expr="(ISNULL g.website) AND (NOT ISNULL g.human) AND (isdigit(g.human)) AND (g.human EQ crypto_base64_decode(g.verify))">
<mvt:comment>
<!--
This will create the From address in proper format: "Store Name" <store_email@store_domain>
-->
</mvt:comment>
<mvt:assign name="l.mail:from" value="asciichar(34) $ g.store:name $ asciichar(34) $ ' <' $ g.store:email $ '>'" />
<mvt:comment>
<!--
This will create the Reply-To address in proper format: "Visitor Name" <visitor_email@visitor_domain>
-->
</mvt:comment>
<mvt:assign name="l.mail:reply" value="asciichar(34) $ g.contactName $ asciichar(34) $ ' <' $ g.contactEmail $ '>'" />
<mvt:comment>
<!--
By default, this form is designed to send to the store email address.
You can change this by replacing g.store:email with 'my_email@my_domain.com'.
-->
</mvt:comment>
<mvt:assign name="l.mail:to" value="g.store:email" />
<mvt:comment>
<!--
If you would like to CC the form, you can add an address or a comma separated list to CC to
multiple addresses.
<mvt:assign name="l.mail:cc" value="'my_email@my_domain.com'" />
- OR -
<mvt:assign name="l.mail:cc" value="'my_email@my_domain.com,my_other_email@my_domain.com'" />
-->
</mvt:comment>
<mvt:assign name="l.mail:cc" value="''" />
<mvt:comment>
<!--
If you would like to BCC the form, you can add an address or a comma separated list to BCC to
multiple addresses.
<mvt:assign name="l.mail:bcc" value="'my_email@my_domain.com'" />
- OR -
<mvt:assign name="l.mail:bcc" value="'my_email@my_domain.com,my_other_email@my_domain.com'" />
-->
</mvt:comment>
<mvt:assign name="l.mail:bcc" value="''" />
<mvt:comment>
<!--
This will create a custom subject line for the email.
-->
</mvt:comment>
<mvt:assign name="l.mail:subject" value="'[' $ g.store:name $ ' Contact Form] ' $ g.contactSubject" />
<mvt:comment>
<!--
This will create the store message from user input.
-->
</mvt:comment>
<mvt:assign name="l.mail:message" value="'Message from: ' $ g.contactName $ g.eol $ g.eol $ 'Email Address: ' $ g.contactEmail $ g.eol $ g.eol $ 'Message:' $ g.eol $ g.contactMessage" />
<mvt:comment>
<!--
If you would like to send any additional SMTP headers, you can do that here.
-->
</mvt:comment>
<mvt:assign name="l.mail:headers" value="l.mail:headers $ 'Reply-To:' $ l.mail:reply $ g.eol" />
<mvt:assign name="l.mail:headers" value="l.mail:headers $ 'MIME-Version: 1.0' $ g.eol" />
<mvt:assign name="l.mail:headers" value="l.mail:headers $ 'Content-Type: text/plain; charset=utf-8' $ g.eol" />
<mvt:comment>
<!--
This function will send an email to the store.
-->
</mvt:comment>
<mvt:do file="g.Module_Library_Utilities" name="g.sent" value="v9_SendEmail(l.mail)" />
<mvt:comment>
<!--
This function will send a confirmation email to the visitor.
If you do not wish to send a confirmation email, you can either `mvt:comment` this section
out or delete it all together.
-->
</mvt:comment>
<mvt:assign name="l.visitor_mail:from" value="asciichar(34) $ g.store:name $ asciichar(34) $ ' <' $ g.store:email $ '>'" />
<mvt:assign name="l.visitor_mail:to" value="asciichar(34) $ g.contactName $ asciichar(34) $ ' <' $ g.contactEmail $ '>'" />
<mvt:assign name="l.visitor_mail:subject" value="'[' $ g.store:name $ ' Contact Form] ' $ g.contactSubject" />
<mvt:assign name="l.visitor_mail:message" value="'Dear ' $ g.contactName $ ',' $ g.eol $ g.eol $ 'Thank you for contacting ' $ g.store:name $ '; your message has been received.' $ g.eol $ g.eol $ 'Your Message:' $ g.eol $ g.contactMessage" />
<mvt:assign name="l.visitor_mail:headers" value="'Reply-To:' $ asciichar(34) $ g.store:name $ asciichar(34) $ ' <' $ g.store:email $ '>' $ g.eol" />
<mvt:do file="g.Module_Library_Utilities" name="g.visitor_sent" value="v9_SendEmail(l.visitor_mail)" />
<mvt:if expr="g.sent">
<meta http-equiv="refresh" content="0;url=&mvte:urls:CTUS:auto_sep;status=submitted" />
<mvt:else>
<meta http-equiv="refresh" content="0;url=&mvte:urls:CTUS:auto_sep;status=error" />
</mvt:if>
<mvt:else>
<meta http-equiv="refresh" content="0;url=&mvte:urls:CTUS:auto_sep;status=error&contactName=&mvte:global:contactName;&contactEmail=&mvte:global:contactEmail;&contactSubject=&mvte:global:contactSubject;&contactMessage=&mvte:global:contactMessage;&fault=has-error" />
</mvt:if>
</mvt:if>
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