CiviCRM processing always enabled – can’t be disabled

After setting up a new form with “Enable CiviCRM processing” activated, I couldn’t disable it anymore. I figured out that even for another new form with no tick in that checkbox it seems to be enabled as soon as I click on “Save” for the first time. After saving it is suddenly enabled in the CiviCRM tab with all the fields (Entity, Action, Additional parameters) filled in with the defaults.

After some investigation I found out that even for a new form where the Enable checkbox is deactivated, its actual value is set to 1:
<label for=”enable-civicrm”><input type=”checkbox” id=”enable-civicrm” name=”enable-civicrm” class=”toggle-form-table” value=”1″> Enable CIVICRM processing</label>

When clicking on “Save” the POST request contains the data of the hidden fields for CiviCRM processing (see the end of the listing). The complete POST request is:

_wpnonce	"5e54363c1c"
_wp_http_referer	"/wp-admin/admin.php?page=wpcf7-new"
post_ID	"-1"
wpcf7-locale	"de_DE"
action	"save"
active-tab	"4"
post_title	""
wpcf7-form	"<label>+Dein+Name\r\n++++[text*+your-name]+</label>\r\n\r\n<label>+Deine+E-Mail-Adresse\r\n++++[email*+your-email]+</label>\r\n\r\n<label>+Betreff\r\n++++[text*+your-subject]+</label>\r\n\r\n<label>+Deine+Nachricht+(optional)\r\n++++[textarea+your-message]+</label>\r\n\r\n[submit+\"Senden\"]"
wpcf7-mail[recipient]	"[_site_admin_email]"
wpcf7-mail[sender]	"[_site_title]+<[email protected]>"
wpcf7-mail[subject]	"[_site_title]+?[your-subject]“"
wpcf7-mail[additional_headers]	"Reply-To:+[your-email]"
wpcf7-mail[body]	"Von:+[your-name]+<[your-email]>\r\nBetreff:+[your-subject]\r\n\r\nNachrichtentext:\r\n[your-message]\r\n\r\n--+\r\nDiese+E-Mail+wurde+von+einem+Kontaktformular+von+[_site_title]+([_site_url])+gesendet"
wpcf7-mail[attachments]	""
wpcf7-mail-2[recipient]	"[your-email]"
wpcf7-mail-2[sender]	"[_site_title]+<[email protected]>"
wpcf7-mail-2[subject]	"[_site_title]+?[your-subject]“"
wpcf7-mail-2[additional_headers]	"Reply-To:+[_site_admin_email]"
wpcf7-mail-2[body]	"Nachrichtentext:\r\n[your-message]\r\n\r\n--+\r\nDiese+E-Mail+wurde+von+einem+Kontaktformular+von+[_site_title]+([_site_url])+gesendet"
wpcf7-mail-2[attachments]	""
wpcf7-messages[mail_sent_ok]	"Vielen+Dank+für+deine+Nachricht.+Sie+wurde+gesendet."
wpcf7-messages[mail_sent_ng]	"Beim+Versuch,+deine+Nachricht+zu+senden,+ist+ein+Fehler+aufgetreten.+Bitte+versuche+es+sp?ter+nochmal."
wpcf7-messages[validation_error]	"Ein+oder+mehrere+Felder+weisen+einen+Fehler+auf.+Bitte+überprüfe+das+und+versuche+es+erneut."
wpcf7-messages[spam]	"Beim+Versuch,+deine+Nachricht+zu+senden,+ist+ein+Fehler+aufgetreten.+Bitte+versuche+es+sp?ter+nochmal."
wpcf7-messages[accept_terms]	"Du+musst+die+Bedingungen+und+Konditionen+akzeptieren,+bevor+du+deine+Nachricht+senden+kannst."
wpcf7-messages[invalid_required]	"Dies+ist+ein+Pflichtfeld."
wpcf7-messages[invalid_too_long]	"Deine+Eingabe+ist+zu+lang."
wpcf7-messages[invalid_too_short]	"Deine+Eingabe+ist+zu+kurz."
wpcf7-messages[upload_failed]	"Beim+Hochladen+der+Datei+ist+ein+unbekannter+Fehler+aufgetreten."
wpcf7-messages[upload_file_type_invalid]	"Es+ist+nicht+erlaubt,+Dateien+dieses+Typs+hochzuladen."
wpcf7-messages[upload_file_too_large]	"Diese+Datei+ist+zu+gro?."
wpcf7-messages[upload_failed_php_error]	"Beim+Hochladen+der+Datei+ist+ein+Fehler+aufgetreten."
wpcf7-messages[invalid_date]	"Das+Datumsformat+ist+ungültig."
wpcf7-messages[date_too_early]	"Das+Datum+liegt+vor+dem+frühesten+zul?ssigen+Datum."
wpcf7-messages[date_too_late]	"Das+Datum+liegt+nach+dem+sp?testen+zul?ssigen+Datum."
wpcf7-messages[invalid_number]	"Das+Zahlenformat+ist+ungültig."
wpcf7-messages[number_too_small]	"Die+Zahl+ist+niedriger+als+das+zul?ssige+Minimum."
wpcf7-messages[number_too_large]	"Die+Zahl+ist+gr??er+als+das+zul?ssige+Maximum."
wpcf7-messages[quiz_answer_not_correct]	"Die+Antwort+auf+das+Quiz+ist+falsch."
wpcf7-messages[invalid_email]	"Die+eingegebene+E-Mail-Adresse+ist+ungültig."
wpcf7-messages[invalid_url]	"Die+URL+ist+ungültig."
wpcf7-messages[invalid_tel]	"Die+Telefonnummer+ist+ungültig."
wpcf7-additional-settings	""
civicrm-entity	"Contact"
civicrm-action	"create"
civicrm-parameters	"contact_type=Individual&source=Wordpress"
wpcf7-save	"Speichern"

What can I do? I cannot set up forms without the CRM integration now. Additionally, I think it’s not possible to change settings of other forms without enabling the processing at the same time. I’d like to avoid re-installing the plugin since I have other forms set up. Could this fix it? Is there a way to backup them and replay them after re-installing?

Thank you for your help.