Joomla-Registration and Problems with the Usergroups

Question

hi

Since a couple of days, i have some problems with the chronoforms joomla user-registration. Everything works, except the connection to the right Usergroup.
It doesn't work anymore. The field usergroup in the Joomla User Management is empty.
I didn't made any changes to the form. The current Joomla! Version is 3.7.5.

This is, was the Debugger says

[_PLUGINS_] => Array
        (
            [joomla_registration] => Array
                (
                    [*isRoot] => 
                    [id] => 1971
                    [name] => firstname lastname
                    [username] => admin+005@allerhand.ch
                    [email] => admin+005@allerhand.ch
                    [password] => $2y$10$f3OtVNsqPpL5E/xM4sZK9uZ8.seZgnEWEP3rCiyvuzNr32B1zZ1z2
                    [password_clear] => OicVlyLm
                    [block] => 1
                    [sendEmail] => 0
                    [registerDate] => 2017-10-13 11:22:51
                    [lastvisitDate] => 
                    [activation] => e4b9b1121d6ba651a69dfc4b66baccb2
                    [groups] => Array
                        (
                            [0] => 32
                        )

                    [lastResetTime] => 
                    [resetCount] => 
                    [requireReset] => 
                    [*_params] => Joomla\Registry\Registry Object
                        (
                            [data:protected] => stdClass Object
                                (
                                )

                            [initialized:protected] => 
                            [separator] => .
                        )

                    [*_authGroups] => 
                    [*_authLevels] => Array
                        (
                            [0] => 1
                            [1] => 1
                        )

                    [*_authActions] => 
                    [*_errorMsg] => 
                    [*userHelper] => JUserWrapperHelper Object
                        (
                        )

                    [*_errors] => Array
                        (
                        )

                    [aid] => 0
                    [cookieLogin] => 
                    [option] => com_acymailing
                    [chronoform] => regform_mitgliedschaft_forumenergie
                    [event] => submit
                    [anrede] => Frau
                    [firstname] => firstname
                    [lastname] => lastname
                    [firma] => firma
                    [firma_2] => firma_2
                    [strasse] => strasse
                    [strasse2] => strasse2
                    [plz] => plz
                    [ort] => ort
                    [epost] => admin+005@allerhand.ch
                    [telefon] => 1234567890
                    [mobile] => 23456
                    [beruf] => ArchitektIn
                    [anderer_beruf] => anderer_beruf
                    [position] => position
                    [geburtsdatum] => geburtsdatum
                    [eintrittsgrund] => eintrittsgrund
                    [check_newsletter] => JA
                    [bemerkungen] => bemerkungen
                    [senden] => Senden
                    [ctrl] => sub
                    [task] => optin
                    [curl] => 
                    [password2] => OicVlyLm
                    [usertype] => deprecated
                )

        )

    [id] => 1971
    [ip_address] => 178.197.228.125
)

Thank you
Christoph