After having the plugin deinstalled for a while and now reinstalling it the issue does not occur anymore. Maybe a issue with some database-cache by W3TC.
give_site_address_before_migrate and home_url did match!
Maybe wp-options -> cron was full with these entries since I the home URL at launching the real page and did not notice it.
the cron in wp-options looked like below and after emptying the option it filled up again… maybe a cache issue. seemes it has solved itself.
‘a:35348:{i:1485278748;a:1:{s:40:”give_validate_license_when_site_migrated”;a:1:{s:32:”40cd750bba9870f18aada2478b24840a”;a:2:{s:8:”schedule”;b:0;s:4:”args”;a:0:{}}}}i:1485278755;a:1:{s:40:”give_validate_license_when_site_migrated”;a:1:{s:32:”40cd750bba9870f18aada2478b24840a”;a:2:{s:8:”schedule”;b:0;s:4:”args”;a:0:{}}}}i:1485278759;a:1:{s:40:”give_validate_license_when_site_migrated”;a:1:{s:32:”40cd750bba9870f18aada2478b24840a”;a:2:{s:8:”schedule”;b:0;s:4:”args”;a:0:{}}}}i:1485278760;a:1:{s:40:”give_validate_license_when_site_migrated”;a:1:{s:32:”40cd750bba9870f18aada2478b24840a”;a:2:{s:8:”schedule”;b:0;s:4:”args”;a:0:{}}}}i:1485278763;a:1:{s:40:”give_validate_license_when_site_migrated”;a:1:{s:32:”40cd750bba9870f18aada2478b24840a”;a:2:{s:8:”schedule”;b:0;s:4:”args”;a:0:{}}}}i:1485278775;a:1:{s:40:”give_validate_license_when_site_migrated”;a:1:{s:32:”40cd750bba9870f18aada2478b24840a”;a:2:{s:8:”schedule”;b:0;s:4:”args”;a:0:{}}}}i:1485278786;a:1:{s:40:”give_validate_license_when_site_migrated”;a:1:{s:3……