The stuff that was populated before I change the grid blocks, is displaying correctly in the front end. But if I create a new content and populate it - it shows it all in one span (eg. 12 span) despite the content edit page shows it is 8x1 span on the grid.
Also as you can see it displays wrongly in he backoffice - and does it for previously populated+saved content as well as for the newly created one.
That's what I did before - I deleted and populated the content again when I encountered this issue before since I am for now working locally and developing the doc type.
But cannot do it really in the long term. Suppose we publish the doc type and I need to tweak the grid later when we already have production content and suddenly everything goes wrong and the public content get affected - what then?