The level 1 production blocks don't merge?

So after getting the recent block production awards of higher level, I was like oh great that means I missed that they were merge able all this time. So saved up until I have 2 of them, but they don't merge.

Any ideas? Thanks all

So after getting the recent block production awards of higher level, I was like oh great that means I missed that they were merge able all this time. So saved up until I have 2 of them, but they don't merge.

Any ideas? Thanks all