Hi Anh,
We return to this issue.
We can see that exist JS error when we try to add MetaBox Group into Admin page: http://prntscr.com/mwwyyk
And when we add a Group with 2 blocks, it merge everything in one.
Look:
1) http://prntscr.com/mwx06l
2) http://prntscr.com/mwx0gs
How can we fix this error?
Thank in advance,