There is nothing we can tell you that will change this. Double down is restricted to hard 9, 10, or 11 only in some versions.
https://my-mobile.eu/viewtopic.php?t=63017
http://wirtualnapolityka.cba.pl/showthread.php?tid=7114
https://www.ww2.site/forum/viewtopic.php?t=288195
http://60.250.226.63/ipkb/viewtopic.php?f=41&t=1959467
https://my-mobile.eu/viewtopic.php?t=43426
https://planeswalkers.org/viewtopic.php?t=30977
http://horsecity.ru/phpBB3/viewtopic.php?f=34&t=478666
http://delebutik.dk/index.php?topic=50894.new#new
http://horsecity.ru/phpBB3/viewtopic.php?f=7&t=153362
http://foro.murenacidos.com/showthread.php?tid=15475
https://talkingpoints.org/subx/showthread.php?tid=76503
https://my-mobile.eu/viewtopic.php?t=73142
