Starting to put my GC 1 together and I've noticed that the mortise and tenon joints in the wood frame that is attached to the bottoms of the slate pieces are coming apart. The middle piece appears to have never been glued but at least some of the joints at the corners of the frames were glued. Am I correct that the four corner joints on these frames should be glued and that the middle cross piece just floats? Thanks.
These are the frames I'm talking about:

These are the frames I'm talking about:

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