Hi @pics.munmun
You are comparing different load cases ( case 1 and case 4)
Peresented value is bending moment in slab section calculated per unit length
see picture
If we assume that strip width is 1m - unit length (and Mxx is constant along strip section) then Mxx can be assumed as total moment transferred by slab strip with width equal to unit length (1 m)
If moment is variable along slab section we can obtain total moment transferred by slab cut by integrating Mxx along slab cut see below (sorry for bad picture quality)
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