Hello,
1) I can see only 1 variable product on your site – http://prntscr.com/smrmu2 it has attribute – http://prntscr.com/smrn3l , but the type of it is – http://prntscr.com/smrnjw so – http://prntscr.com/smrnoj Please watch the video one more time and follow it step by step.
2) Have you tried to disable additional plugins? It looks like one of them caused the situation with the cart. Sorry, but we do not provide support for 3rd-party plugins.
Regards